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Finding the Fourth Proportional to 1,139.99, 1,572.55 and 691.79

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Solution

The fourth proportional to 1,139.99, 1,572.55 and 691.79 is: 954.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.99 : 1,572.55 = 691.79 : x
  2. Step 2: Convert to fraction form
    1,139.99/1,572.55 = 691.79/x
  3. Step 3: Cross multiply
    1,139.99x = 1,572.55 × 691.79
  4. Step 4: Simplify right side
    1,139.99x = 1,087,864.77
  5. Step 5: Solve for x
    x = 1,087,864.77/1,139.99
  6. Step 6: Final answer
    x = 954.28

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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.