Home / 129,355.13-178,510.03-72,766.50

Finding the Fourth Proportional to 129,355.13, 178,510.03 and 72,766.50

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Solution

The fourth proportional to 129,355.13, 178,510.03 and 72,766.50 is: 100,417.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,355.13 : 178,510.03 = 72,766.50 : x
  2. Step 2: Convert to fraction form
    129,355.13/178,510.03 = 72,766.50/x
  3. Step 3: Cross multiply
    129,355.13x = 178,510.03 × 72,766.50
  4. Step 4: Simplify right side
    129,355.13x = 12,989,549,916.08
  5. Step 5: Solve for x
    x = 12,989,549,916.08/129,355.13
  6. Step 6: Final answer
    x = 100,417.74

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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.