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Finding the Fourth Proportional to 108,428.80, 162,643.20 and 38,315.20

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Solution

The fourth proportional to 108,428.80, 162,643.20 and 38,315.20 is: 57,472.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,428.80 : 162,643.20 = 38,315.20 : x
  2. Step 2: Convert to fraction form
    108,428.80/162,643.20 = 38,315.20/x
  3. Step 3: Cross multiply
    108,428.80x = 162,643.20 × 38,315.20
  4. Step 4: Simplify right side
    108,428.80x = 6,231,706,736.64
  5. Step 5: Solve for x
    x = 6,231,706,736.64/108,428.80
  6. Step 6: Final answer
    x = 57,472.80

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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.