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Finding the Fourth Proportional to 129,353.40, 178,507.44 and 72,764.78

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Solution

The fourth proportional to 129,353.40, 178,507.44 and 72,764.78 is: 100,415.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,353.40 : 178,507.44 = 72,764.78 : x
  2. Step 2: Convert to fraction form
    129,353.40/178,507.44 = 72,764.78/x
  3. Step 3: Cross multiply
    129,353.40x = 178,507.44 × 72,764.78
  4. Step 4: Simplify right side
    129,353.40x = 12,989,053,707.43
  5. Step 5: Solve for x
    x = 12,989,053,707.43/129,353.40
  6. Step 6: Final answer
    x = 100,415.25

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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.