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Finding the Fourth Proportional to 631.11, 946.70 and 220.31

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Solution

The fourth proportional to 631.11, 946.70 and 220.31 is: 330.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.11 : 946.70 = 220.31 : x
  2. Step 2: Convert to fraction form
    631.11/946.70 = 220.31/x
  3. Step 3: Cross multiply
    631.11x = 946.70 × 220.31
  4. Step 4: Simplify right side
    631.11x = 208,567.48
  5. Step 5: Solve for x
    x = 208,567.48/631.11
  6. Step 6: Final answer
    x = 330.48

Related Problems

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Half scale
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Double scale
Find fourth proportional to 632.11, 948.20 and 221.31
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.