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Finding the Fourth Proportional to 1,138.93, 1,572.08 and 713.78

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Solution

The fourth proportional to 1,138.93, 1,572.08 and 713.78 is: 985.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.93 : 1,572.08 = 713.78 : x
  2. Step 2: Convert to fraction form
    1,138.93/1,572.08 = 713.78/x
  3. Step 3: Cross multiply
    1,138.93x = 1,572.08 × 713.78
  4. Step 4: Simplify right side
    1,138.93x = 1,122,113.73
  5. Step 5: Solve for x
    x = 1,122,113.73/1,138.93
  6. Step 6: Final answer
    x = 985.24

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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.