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Finding the Fourth Proportional to 103,638.60, 155,239.20 and 92,557.80

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Solution

The fourth proportional to 103,638.60, 155,239.20 and 92,557.80 is: 138,641.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.60 : 155,239.20 = 92,557.80 : x
  2. Step 2: Convert to fraction form
    103,638.60/155,239.20 = 92,557.80/x
  3. Step 3: Cross multiply
    103,638.60x = 155,239.20 × 92,557.80
  4. Step 4: Simplify right side
    103,638.60x = 14,368,598,825.76
  5. Step 5: Solve for x
    x = 14,368,598,825.76/103,638.60
  6. Step 6: Final answer
    x = 138,641.38

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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.