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Finding the Fourth Proportional to 103,418.60, 155,127.90 and 92,143.40

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Solution

The fourth proportional to 103,418.60, 155,127.90 and 92,143.40 is: 138,215.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,418.60 : 155,127.90 = 92,143.40 : x
  2. Step 2: Convert to fraction form
    103,418.60/155,127.90 = 92,143.40/x
  3. Step 3: Cross multiply
    103,418.60x = 155,127.90 × 92,143.40
  4. Step 4: Simplify right side
    103,418.60x = 14,294,012,140.86
  5. Step 5: Solve for x
    x = 14,294,012,140.86/103,418.60
  6. Step 6: Final answer
    x = 138,215.10

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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.