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Finding the Fourth Proportional to 108,935.20, 163,402.80 and 90,503.20

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Solution

The fourth proportional to 108,935.20, 163,402.80 and 90,503.20 is: 135,754.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,935.20 : 163,402.80 = 90,503.20 : x
  2. Step 2: Convert to fraction form
    108,935.20/163,402.80 = 90,503.20/x
  3. Step 3: Cross multiply
    108,935.20x = 163,402.80 × 90,503.20
  4. Step 4: Simplify right side
    108,935.20x = 14,788,476,288.96
  5. Step 5: Solve for x
    x = 14,788,476,288.96/108,935.20
  6. Step 6: Final answer
    x = 135,754.80

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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.