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Finding the Fourth Proportional to 391,129.40, 586,689.14 and 124,886.54

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Solution

The fourth proportional to 391,129.40, 586,689.14 and 124,886.54 is: 187,328.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,129.40 : 586,689.14 = 124,886.54 : x
  2. Step 2: Convert to fraction form
    391,129.40/586,689.14 = 124,886.54/x
  3. Step 3: Cross multiply
    391,129.40x = 586,689.14 × 124,886.54
  4. Step 4: Simplify right side
    391,129.40x = 73,269,578,529.11
  5. Step 5: Solve for x
    x = 73,269,578,529.11/391,129.40
  6. Step 6: Final answer
    x = 187,328.23

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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.