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Finding the Fourth Proportional to 1,134.28, 1,565.54 and 947.56

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Solution

The fourth proportional to 1,134.28, 1,565.54 and 947.56 is: 1,307.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.28 : 1,565.54 = 947.56 : x
  2. Step 2: Convert to fraction form
    1,134.28/1,565.54 = 947.56/x
  3. Step 3: Cross multiply
    1,134.28x = 1,565.54 × 947.56
  4. Step 4: Simplify right side
    1,134.28x = 1,483,443.08
  5. Step 5: Solve for x
    x = 1,483,443.08/1,134.28
  6. Step 6: Final answer
    x = 1,307.83

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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.