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Finding the Fourth Proportional to 74,978.90, 103,403.86 and 62,211.86

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Solution

The fourth proportional to 74,978.90, 103,403.86 and 62,211.86 is: 85,796.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,978.90 : 103,403.86 = 62,211.86 : x
  2. Step 2: Convert to fraction form
    74,978.90/103,403.86 = 62,211.86/x
  3. Step 3: Cross multiply
    74,978.90x = 103,403.86 × 62,211.86
  4. Step 4: Simplify right side
    74,978.90x = 6,432,946,461.78
  5. Step 5: Solve for x
    x = 6,432,946,461.78/74,978.90
  6. Step 6: Final answer
    x = 85,796.76

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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.