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Finding the Fourth Proportional to 125,008.74, 172,512 and 68,420.10

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Solution

The fourth proportional to 125,008.74, 172,512 and 68,420.10 is: 94,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,008.74 : 172,512 = 68,420.10 : x
  2. Step 2: Convert to fraction form
    125,008.74/172,512 = 68,420.10/x
  3. Step 3: Cross multiply
    125,008.74x = 172,512 × 68,420.10
  4. Step 4: Simplify right side
    125,008.74x = 11,803,288,291.20
  5. Step 5: Solve for x
    x = 11,803,288,291.20/125,008.74
  6. Step 6: Final answer
    x = 94,419.70

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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.