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Finding the Fourth Proportional to 125,021.76, 172,541.76 and 74,719.68

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Solution

The fourth proportional to 125,021.76, 172,541.76 and 74,719.68 is: 103,120.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,021.76 : 172,541.76 = 74,719.68 : x
  2. Step 2: Convert to fraction form
    125,021.76/172,541.76 = 74,719.68/x
  3. Step 3: Cross multiply
    125,021.76x = 172,541.76 × 74,719.68
  4. Step 4: Simplify right side
    125,021.76x = 12,892,265,093.84
  5. Step 5: Solve for x
    x = 12,892,265,093.84/125,021.76
  6. Step 6: Final answer
    x = 103,120.17

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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.