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Finding the Fourth Proportional to 129,604.61, 178,855.16 and 72,247.57

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Solution

The fourth proportional to 129,604.61, 178,855.16 and 72,247.57 is: 99,702.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,604.61 : 178,855.16 = 72,247.57 : x
  2. Step 2: Convert to fraction form
    129,604.61/178,855.16 = 72,247.57/x
  3. Step 3: Cross multiply
    129,604.61x = 178,855.16 × 72,247.57
  4. Step 4: Simplify right side
    129,604.61x = 12,921,849,883.59
  5. Step 5: Solve for x
    x = 12,921,849,883.59/129,604.61
  6. Step 6: Final answer
    x = 99,702.08

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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.