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Finding the Fourth Proportional to 138,720.16, 208,101.84 and 45,204.16

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Solution

The fourth proportional to 138,720.16, 208,101.84 and 45,204.16 is: 67,813.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,720.16 : 208,101.84 = 45,204.16 : x
  2. Step 2: Convert to fraction form
    138,720.16/208,101.84 = 45,204.16/x
  3. Step 3: Cross multiply
    138,720.16x = 208,101.84 × 45,204.16
  4. Step 4: Simplify right side
    138,720.16x = 9,407,068,871.65
  5. Step 5: Solve for x
    x = 9,407,068,871.65/138,720.16
  6. Step 6: Final answer
    x = 67,813.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.