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Finding the Fourth Proportional to 945.70, 1,305.53 and 631.15

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Solution

The fourth proportional to 945.70, 1,305.53 and 631.15 is: 871.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.70 : 1,305.53 = 631.15 : x
  2. Step 2: Convert to fraction form
    945.70/1,305.53 = 631.15/x
  3. Step 3: Cross multiply
    945.70x = 1,305.53 × 631.15
  4. Step 4: Simplify right side
    945.70x = 823,985.26
  5. Step 5: Solve for x
    x = 823,985.26/945.70
  6. Step 6: Final answer
    x = 871.30

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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.