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Finding the Fourth Proportional to 129,684.85, 178,964.74 and 72,324.24

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Solution

The fourth proportional to 129,684.85, 178,964.74 and 72,324.24 is: 99,807.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,684.85 : 178,964.74 = 72,324.24 : x
  2. Step 2: Convert to fraction form
    129,684.85/178,964.74 = 72,324.24/x
  3. Step 3: Cross multiply
    129,684.85x = 178,964.74 × 72,324.24
  4. Step 4: Simplify right side
    129,684.85x = 12,943,488,226.59
  5. Step 5: Solve for x
    x = 12,943,488,226.59/129,684.85
  6. Step 6: Final answer
    x = 99,807.25

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1.5x scale

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.