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Finding the Fourth Proportional to 763.23, 1,139.27 and 655.71

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Solution

The fourth proportional to 763.23, 1,139.27 and 655.71 is: 978.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.23 : 1,139.27 = 655.71 : x
  2. Step 2: Convert to fraction form
    763.23/1,139.27 = 655.71/x
  3. Step 3: Cross multiply
    763.23x = 1,139.27 × 655.71
  4. Step 4: Simplify right side
    763.23x = 747,027.45
  5. Step 5: Solve for x
    x = 747,027.45/763.23
  6. Step 6: Final answer
    x = 978.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.