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Finding the Fourth Proportional to 138,618.08, 191,293.16 and 74,955.88

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Solution

The fourth proportional to 138,618.08, 191,293.16 and 74,955.88 is: 103,439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,618.08 : 191,293.16 = 74,955.88 : x
  2. Step 2: Convert to fraction form
    138,618.08/191,293.16 = 74,955.88/x
  3. Step 3: Cross multiply
    138,618.08x = 191,293.16 × 74,955.88
  4. Step 4: Simplify right side
    138,618.08x = 14,338,547,145.78
  5. Step 5: Solve for x
    x = 14,338,547,145.78/138,618.08
  6. Step 6: Final answer
    x = 103,439.23

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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.