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Finding the Third Proportional to 5,280 and 8,418

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Solution

The third proportional to 5,280 and 8,418 is: 13,420.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280 : 8,418 = 8,418 : x
  2. Step 2: Convert to fraction form
    5,280/8,418 = 8,418/x
  3. Step 3: Cross multiply
    5,280x = 8,418 × 8,418
  4. Step 4: Simplify right side
    5,280x = 70,862,724
  5. Step 5: Solve for x
    x = 70,862,724/5,280
  6. Step 6: Final answer
    x = 13,420.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.