Home / 12,988.17-19,478.11-4,220.97

Finding the Fourth Proportional to 12,988.17, 19,478.11 and 4,220.97

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Solution

The fourth proportional to 12,988.17, 19,478.11 and 4,220.97 is: 6,330.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,988.17 : 19,478.11 = 4,220.97 : x
  2. Step 2: Convert to fraction form
    12,988.17/19,478.11 = 4,220.97/x
  3. Step 3: Cross multiply
    12,988.17x = 19,478.11 × 4,220.97
  4. Step 4: Simplify right side
    12,988.17x = 82,216,517.97
  5. Step 5: Solve for x
    x = 82,216,517.97/12,988.17
  6. Step 6: Final answer
    x = 6,330.11

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1.5x scale

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.