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Finding the Fourth Proportional to 1,139.79, 1,572.57 and 697.23

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Solution

The fourth proportional to 1,139.79, 1,572.57 and 697.23 is: 961.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.79 : 1,572.57 = 697.23 : x
  2. Step 2: Convert to fraction form
    1,139.79/1,572.57 = 697.23/x
  3. Step 3: Cross multiply
    1,139.79x = 1,572.57 × 697.23
  4. Step 4: Simplify right side
    1,139.79x = 1,096,442.98
  5. Step 5: Solve for x
    x = 1,096,442.98/1,139.79
  6. Step 6: Final answer
    x = 961.97

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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.