Home / 21,217.34-29,280.49-12,720.85

Finding the Fourth Proportional to 21,217.34, 29,280.49 and 12,720.85

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Solution

The fourth proportional to 21,217.34, 29,280.49 and 12,720.85 is: 17,555.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,217.34 : 29,280.49 = 12,720.85 : x
  2. Step 2: Convert to fraction form
    21,217.34/29,280.49 = 12,720.85/x
  3. Step 3: Cross multiply
    21,217.34x = 29,280.49 × 12,720.85
  4. Step 4: Simplify right side
    21,217.34x = 372,472,616.21
  5. Step 5: Solve for x
    x = 372,472,616.21/21,217.34
  6. Step 6: Final answer
    x = 17,555.10

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1.5x scale

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.