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Finding the Fourth Proportional to 129,486.84, 178,695.18 and 72,900.24

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Solution

The fourth proportional to 129,486.84, 178,695.18 and 72,900.24 is: 100,604.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,486.84 : 178,695.18 = 72,900.24 : x
  2. Step 2: Convert to fraction form
    129,486.84/178,695.18 = 72,900.24/x
  3. Step 3: Cross multiply
    129,486.84x = 178,695.18 × 72,900.24
  4. Step 4: Simplify right side
    129,486.84x = 13,026,921,508.84
  5. Step 5: Solve for x
    x = 13,026,921,508.84/129,486.84
  6. Step 6: Final answer
    x = 100,604.21

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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.