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Finding the Fourth Proportional to 86,280, 129,420 and 27,912

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Solution

The fourth proportional to 86,280, 129,420 and 27,912 is: 41,868

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,280 : 129,420 = 27,912 : x
  2. Step 2: Convert to fraction form
    86,280/129,420 = 27,912/x
  3. Step 3: Cross multiply
    86,280x = 129,420 × 27,912
  4. Step 4: Simplify right side
    86,280x = 3,612,371,040
  5. Step 5: Solve for x
    x = 3,612,371,040/86,280
  6. Step 6: Final answer
    x = 41,868

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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.