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Finding the Fourth Proportional to 125,142, 172,669.08 and 74,170.68

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Solution

The fourth proportional to 125,142, 172,669.08 and 74,170.68 is: 102,339.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,142 : 172,669.08 = 74,170.68 : x
  2. Step 2: Convert to fraction form
    125,142/172,669.08 = 74,170.68/x
  3. Step 3: Cross multiply
    125,142x = 172,669.08 × 74,170.68
  4. Step 4: Simplify right side
    125,142x = 12,806,983,078.57
  5. Step 5: Solve for x
    x = 12,806,983,078.57/125,142
  6. Step 6: Final answer
    x = 102,339.61

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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.