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Finding the Fourth Proportional to 1,138.47, 1,707.95 and 358.70

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Solution

The fourth proportional to 1,138.47, 1,707.95 and 358.70 is: 538.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.47 : 1,707.95 = 358.70 : x
  2. Step 2: Convert to fraction form
    1,138.47/1,707.95 = 358.70/x
  3. Step 3: Cross multiply
    1,138.47x = 1,707.95 × 358.70
  4. Step 4: Simplify right side
    1,138.47x = 612,634.61
  5. Step 5: Solve for x
    x = 612,634.61/1,138.47
  6. Step 6: Final answer
    x = 538.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.