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Finding the Fourth Proportional to 72,000, 99,360 and 42,192

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Solution

The fourth proportional to 72,000, 99,360 and 42,192 is: 58,224.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,000 : 99,360 = 42,192 : x
  2. Step 2: Convert to fraction form
    72,000/99,360 = 42,192/x
  3. Step 3: Cross multiply
    72,000x = 99,360 × 42,192
  4. Step 4: Simplify right side
    72,000x = 4,192,197,120
  5. Step 5: Solve for x
    x = 4,192,197,120/72,000
  6. Step 6: Final answer
    x = 58,224.96

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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.