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Finding the Fourth Proportional to 15,208.50, 20,990.16 and 8,920.92

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Solution

The fourth proportional to 15,208.50, 20,990.16 and 8,920.92 is: 12,312.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,208.50 : 20,990.16 = 8,920.92 : x
  2. Step 2: Convert to fraction form
    15,208.50/20,990.16 = 8,920.92/x
  3. Step 3: Cross multiply
    15,208.50x = 20,990.16 × 8,920.92
  4. Step 4: Simplify right side
    15,208.50x = 187,251,538.15
  5. Step 5: Solve for x
    x = 187,251,538.15/15,208.50
  6. Step 6: Final answer
    x = 12,312.29

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Double scale
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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.