Home / 15,420.17-21,279.78-8,705.78

Finding the Fourth Proportional to 15,420.17, 21,279.78 and 8,705.78

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Solution

The fourth proportional to 15,420.17, 21,279.78 and 8,705.78 is: 12,013.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.17 : 21,279.78 = 8,705.78 : x
  2. Step 2: Convert to fraction form
    15,420.17/21,279.78 = 8,705.78/x
  3. Step 3: Cross multiply
    15,420.17x = 21,279.78 × 8,705.78
  4. Step 4: Simplify right side
    15,420.17x = 185,257,083.13
  5. Step 5: Solve for x
    x = 185,257,083.13/15,420.17
  6. Step 6: Final answer
    x = 12,013.95

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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.