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Finding the Fourth Proportional to 129,780, 179,122.32 and 73,192.32

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Solution

The fourth proportional to 129,780, 179,122.32 and 73,192.32 is: 101,020.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,780 : 179,122.32 = 73,192.32 : x
  2. Step 2: Convert to fraction form
    129,780/179,122.32 = 73,192.32/x
  3. Step 3: Cross multiply
    129,780x = 179,122.32 × 73,192.32
  4. Step 4: Simplify right side
    129,780x = 13,110,378,164.58
  5. Step 5: Solve for x
    x = 13,110,378,164.58/129,780
  6. Step 6: Final answer
    x = 101,020.02

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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.