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Finding the Fourth Proportional to 15,990.40, 22,065.78 and 8,916.40

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Solution

The fourth proportional to 15,990.40, 22,065.78 and 8,916.40 is: 12,304.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,990.40 : 22,065.78 = 8,916.40 : x
  2. Step 2: Convert to fraction form
    15,990.40/22,065.78 = 8,916.40/x
  3. Step 3: Cross multiply
    15,990.40x = 22,065.78 × 8,916.40
  4. Step 4: Simplify right side
    15,990.40x = 196,747,320.79
  5. Step 5: Solve for x
    x = 196,747,320.79/15,990.40
  6. Step 6: Final answer
    x = 12,304.09

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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.