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Finding the Fourth Proportional to 129,298.88, 178,433.54 and 72,709.76

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Solution

The fourth proportional to 129,298.88, 178,433.54 and 72,709.76 is: 100,340.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,298.88 : 178,433.54 = 72,709.76 : x
  2. Step 2: Convert to fraction form
    129,298.88/178,433.54 = 72,709.76/x
  3. Step 3: Cross multiply
    129,298.88x = 178,433.54 × 72,709.76
  4. Step 4: Simplify right side
    129,298.88x = 12,973,859,869.35
  5. Step 5: Solve for x
    x = 12,973,859,869.35/129,298.88
  6. Step 6: Final answer
    x = 100,340.08

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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.