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Finding the Fourth Proportional to 100,232.61, 138,268.55 and 61,979.93

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Solution

The fourth proportional to 100,232.61, 138,268.55 and 61,979.93 is: 85,499.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,232.61 : 138,268.55 = 61,979.93 : x
  2. Step 2: Convert to fraction form
    100,232.61/138,268.55 = 61,979.93/x
  3. Step 3: Cross multiply
    100,232.61x = 138,268.55 × 61,979.93
  4. Step 4: Simplify right side
    100,232.61x = 8,569,875,050.20
  5. Step 5: Solve for x
    x = 8,569,875,050.20/100,232.61
  6. Step 6: Final answer
    x = 85,499.87

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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.