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Finding the Fourth Proportional to 124,638.60, 186,957.90 and 99,985.80

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Solution

The fourth proportional to 124,638.60, 186,957.90 and 99,985.80 is: 149,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,638.60 : 186,957.90 = 99,985.80 : x
  2. Step 2: Convert to fraction form
    124,638.60/186,957.90 = 99,985.80/x
  3. Step 3: Cross multiply
    124,638.60x = 186,957.90 × 99,985.80
  4. Step 4: Simplify right side
    124,638.60x = 18,693,135,197.82
  5. Step 5: Solve for x
    x = 18,693,135,197.82/124,638.60
  6. Step 6: Final answer
    x = 149,978.70

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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.