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Finding the Fourth Proportional to 1,134.48, 1,565.28 and 715.20

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Solution

The fourth proportional to 1,134.48, 1,565.28 and 715.20 is: 986.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.48 : 1,565.28 = 715.20 : x
  2. Step 2: Convert to fraction form
    1,134.48/1,565.28 = 715.20/x
  3. Step 3: Cross multiply
    1,134.48x = 1,565.28 × 715.20
  4. Step 4: Simplify right side
    1,134.48x = 1,119,488.26
  5. Step 5: Solve for x
    x = 1,119,488.26/1,134.48
  6. Step 6: Final answer
    x = 986.79

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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.