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Finding the Fourth Proportional to 72,928.80, 100,642.56 and 42,707.52

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Solution

The fourth proportional to 72,928.80, 100,642.56 and 42,707.52 is: 58,936.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,928.80 : 100,642.56 = 42,707.52 : x
  2. Step 2: Convert to fraction form
    72,928.80/100,642.56 = 42,707.52/x
  3. Step 3: Cross multiply
    72,928.80x = 100,642.56 × 42,707.52
  4. Step 4: Simplify right side
    72,928.80x = 4,298,194,144.05
  5. Step 5: Solve for x
    x = 4,298,194,144.05/72,928.80
  6. Step 6: Final answer
    x = 58,936.86

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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.