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Finding the Fourth Proportional to 711.10, 1,066.65 and 631.90

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Solution

The fourth proportional to 711.10, 1,066.65 and 631.90 is: 947.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.10 : 1,066.65 = 631.90 : x
  2. Step 2: Convert to fraction form
    711.10/1,066.65 = 631.90/x
  3. Step 3: Cross multiply
    711.10x = 1,066.65 × 631.90
  4. Step 4: Simplify right side
    711.10x = 674,016.14
  5. Step 5: Solve for x
    x = 674,016.14/711.10
  6. Step 6: Final answer
    x = 947.85

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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.