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Finding the Fourth Proportional to 129,450.48, 178,642.92 and 72,850.92

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Solution

The fourth proportional to 129,450.48, 178,642.92 and 72,850.92 is: 100,534.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,450.48 : 178,642.92 = 72,850.92 : x
  2. Step 2: Convert to fraction form
    129,450.48/178,642.92 = 72,850.92/x
  3. Step 3: Cross multiply
    129,450.48x = 178,642.92 × 72,850.92
  4. Step 4: Simplify right side
    129,450.48x = 13,014,301,073.49
  5. Step 5: Solve for x
    x = 13,014,301,073.49/129,450.48
  6. Step 6: Final answer
    x = 100,534.98

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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.