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Finding the Fourth Proportional to 74,815.78, 103,255.32 and 42,990.88

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Solution

The fourth proportional to 74,815.78, 103,255.32 and 42,990.88 is: 59,332.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,815.78 : 103,255.32 = 42,990.88 : x
  2. Step 2: Convert to fraction form
    74,815.78/103,255.32 = 42,990.88/x
  3. Step 3: Cross multiply
    74,815.78x = 103,255.32 × 42,990.88
  4. Step 4: Simplify right side
    74,815.78x = 4,439,037,071.48
  5. Step 5: Solve for x
    x = 4,439,037,071.48/74,815.78
  6. Step 6: Final answer
    x = 59,332.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.