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Finding the Fourth Proportional to 1,139.56, 1,572.66 and 766.60

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Solution

The fourth proportional to 1,139.56, 1,572.66 and 766.60 is: 1,057.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.56 : 1,572.66 = 766.60 : x
  2. Step 2: Convert to fraction form
    1,139.56/1,572.66 = 766.60/x
  3. Step 3: Cross multiply
    1,139.56x = 1,572.66 × 766.60
  4. Step 4: Simplify right side
    1,139.56x = 1,205,601.16
  5. Step 5: Solve for x
    x = 1,205,601.16/1,139.56
  6. Step 6: Final answer
    x = 1,057.95

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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.