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Finding the Fourth Proportional to 1,066.79, 1,471.14 and 693.87

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Solution

The fourth proportional to 1,066.79, 1,471.14 and 693.87 is: 956.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,066.79 : 1,471.14 = 693.87 : x
  2. Step 2: Convert to fraction form
    1,066.79/1,471.14 = 693.87/x
  3. Step 3: Cross multiply
    1,066.79x = 1,471.14 × 693.87
  4. Step 4: Simplify right side
    1,066.79x = 1,020,779.91
  5. Step 5: Solve for x
    x = 1,020,779.91/1,066.79
  6. Step 6: Final answer
    x = 956.88

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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.