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Finding the Fourth Proportional to 74,978.49, 103,403.30 and 62,211.47

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Solution

The fourth proportional to 74,978.49, 103,403.30 and 62,211.47 is: 85,796.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,978.49 : 103,403.30 = 62,211.47 : x
  2. Step 2: Convert to fraction form
    74,978.49/103,403.30 = 62,211.47/x
  3. Step 3: Cross multiply
    74,978.49x = 103,403.30 × 62,211.47
  4. Step 4: Simplify right side
    74,978.49x = 6,432,870,467.78
  5. Step 5: Solve for x
    x = 6,432,870,467.78/74,978.49
  6. Step 6: Final answer
    x = 85,796.21

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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.