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Finding the Fourth Proportional to 125,170, 172,734.64 and 74,880.88

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Solution

The fourth proportional to 125,170, 172,734.64 and 74,880.88 is: 103,335.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,170 : 172,734.64 = 74,880.88 : x
  2. Step 2: Convert to fraction form
    125,170/172,734.64 = 74,880.88/x
  3. Step 3: Cross multiply
    125,170x = 172,734.64 × 74,880.88
  4. Step 4: Simplify right side
    125,170x = 12,934,521,849.68
  5. Step 5: Solve for x
    x = 12,934,521,849.68/125,170
  6. Step 6: Final answer
    x = 103,335.64

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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.