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Finding the Fourth Proportional to 1,134.79, 1,565.99 and 686.65

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Solution

The fourth proportional to 1,134.79, 1,565.99 and 686.65 is: 947.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.79 : 1,565.99 = 686.65 : x
  2. Step 2: Convert to fraction form
    1,134.79/1,565.99 = 686.65/x
  3. Step 3: Cross multiply
    1,134.79x = 1,565.99 × 686.65
  4. Step 4: Simplify right side
    1,134.79x = 1,075,287.03
  5. Step 5: Solve for x
    x = 1,075,287.03/1,134.79
  6. Step 6: Final answer
    x = 947.56

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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.