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Finding the Fourth Proportional to 172,112.39, 258,079.50 and 77,260.90

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Solution

The fourth proportional to 172,112.39, 258,079.50 and 77,260.90 is: 115,851.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,112.39 : 258,079.50 = 77,260.90 : x
  2. Step 2: Convert to fraction form
    172,112.39/258,079.50 = 77,260.90/x
  3. Step 3: Cross multiply
    172,112.39x = 258,079.50 × 77,260.90
  4. Step 4: Simplify right side
    172,112.39x = 19,939,454,441.55
  5. Step 5: Solve for x
    x = 19,939,454,441.55/172,112.39
  6. Step 6: Final answer
    x = 115,851.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.