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Finding the Fourth Proportional to 129,756.60, 179,069.32 and 72,400.94

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Solution

The fourth proportional to 129,756.60, 179,069.32 and 72,400.94 is: 99,916.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,756.60 : 179,069.32 = 72,400.94 : x
  2. Step 2: Convert to fraction form
    129,756.60/179,069.32 = 72,400.94/x
  3. Step 3: Cross multiply
    129,756.60x = 179,069.32 × 72,400.94
  4. Step 4: Simplify right side
    129,756.60x = 12,964,786,288.32
  5. Step 5: Solve for x
    x = 12,964,786,288.32/129,756.60
  6. Step 6: Final answer
    x = 99,916.20

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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.