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Finding the Fourth Proportional to 391,128.66, 586,688.03 and 124,885.80

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Solution

The fourth proportional to 391,128.66, 586,688.03 and 124,885.80 is: 187,327.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,128.66 : 586,688.03 = 124,885.80 : x
  2. Step 2: Convert to fraction form
    391,128.66/586,688.03 = 124,885.80/x
  3. Step 3: Cross multiply
    391,128.66x = 586,688.03 × 124,885.80
  4. Step 4: Simplify right side
    391,128.66x = 73,269,003,352.55
  5. Step 5: Solve for x
    x = 73,269,003,352.55/391,128.66
  6. Step 6: Final answer
    x = 187,327.11

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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.