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Finding the Fourth Proportional to 62,860.80, 86,726.32 and 38,978.88

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Solution

The fourth proportional to 62,860.80, 86,726.32 and 38,978.88 is: 53,777.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,860.80 : 86,726.32 = 38,978.88 : x
  2. Step 2: Convert to fraction form
    62,860.80/86,726.32 = 38,978.88/x
  3. Step 3: Cross multiply
    62,860.80x = 86,726.32 × 38,978.88
  4. Step 4: Simplify right side
    62,860.80x = 3,380,494,820.12
  5. Step 5: Solve for x
    x = 3,380,494,820.12/62,860.80
  6. Step 6: Final answer
    x = 53,777.47

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1.5x scale

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.