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Finding the Fourth Proportional to 1,207.42, 1,811.13 and 631.42

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Solution

The fourth proportional to 1,207.42, 1,811.13 and 631.42 is: 947.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.42 : 1,811.13 = 631.42 : x
  2. Step 2: Convert to fraction form
    1,207.42/1,811.13 = 631.42/x
  3. Step 3: Cross multiply
    1,207.42x = 1,811.13 × 631.42
  4. Step 4: Simplify right side
    1,207.42x = 1,143,583.70
  5. Step 5: Solve for x
    x = 1,143,583.70/1,207.42
  6. Step 6: Final answer
    x = 947.13

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.