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Finding the Fourth Proportional to 15,890.95, 21,920.40 and 9,912.24

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Solution

The fourth proportional to 15,890.95, 21,920.40 and 9,912.24 is: 13,673.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,890.95 : 21,920.40 = 9,912.24 : x
  2. Step 2: Convert to fraction form
    15,890.95/21,920.40 = 9,912.24/x
  3. Step 3: Cross multiply
    15,890.95x = 21,920.40 × 9,912.24
  4. Step 4: Simplify right side
    15,890.95x = 217,280,250.69
  5. Step 5: Solve for x
    x = 217,280,250.69/15,890.95
  6. Step 6: Final answer
    x = 13,673.20

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Similar ratio
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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.