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Finding the Fourth Proportional to 98,638.40, 147,884.70 and 54,315.20

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Solution

The fourth proportional to 98,638.40, 147,884.70 and 54,315.20 is: 81,432.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,638.40 : 147,884.70 = 54,315.20 : x
  2. Step 2: Convert to fraction form
    98,638.40/147,884.70 = 54,315.20/x
  3. Step 3: Cross multiply
    98,638.40x = 147,884.70 × 54,315.20
  4. Step 4: Simplify right side
    98,638.40x = 8,032,387,057.44
  5. Step 5: Solve for x
    x = 8,032,387,057.44/98,638.40
  6. Step 6: Final answer
    x = 81,432.66

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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.