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Finding the Fourth Proportional to 108,990.13, 150,378.65 and 63,639.25

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Solution

The fourth proportional to 108,990.13, 150,378.65 and 63,639.25 is: 87,805.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,990.13 : 150,378.65 = 63,639.25 : x
  2. Step 2: Convert to fraction form
    108,990.13/150,378.65 = 63,639.25/x
  3. Step 3: Cross multiply
    108,990.13x = 150,378.65 × 63,639.25
  4. Step 4: Simplify right side
    108,990.13x = 9,569,984,502.01
  5. Step 5: Solve for x
    x = 9,569,984,502.01/108,990.13
  6. Step 6: Final answer
    x = 87,805.97

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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.