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Finding the Fourth Proportional to 28,440, 42,679.44 and 9,972

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Solution

The fourth proportional to 28,440, 42,679.44 and 9,972 is: 14,964.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,440 : 42,679.44 = 9,972 : x
  2. Step 2: Convert to fraction form
    28,440/42,679.44 = 9,972/x
  3. Step 3: Cross multiply
    28,440x = 42,679.44 × 9,972
  4. Step 4: Simplify right side
    28,440x = 425,599,375.68
  5. Step 5: Solve for x
    x = 425,599,375.68/28,440
  6. Step 6: Final answer
    x = 14,964.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.