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Finding the Fourth Proportional to 12,215.53, 16,867.95 and 7,685.76

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Solution

The fourth proportional to 12,215.53, 16,867.95 and 7,685.76 is: 10,612.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,215.53 : 16,867.95 = 7,685.76 : x
  2. Step 2: Convert to fraction form
    12,215.53/16,867.95 = 7,685.76/x
  3. Step 3: Cross multiply
    12,215.53x = 16,867.95 × 7,685.76
  4. Step 4: Simplify right side
    12,215.53x = 129,643,002.38
  5. Step 5: Solve for x
    x = 129,643,002.38/12,215.53
  6. Step 6: Final answer
    x = 10,612.97

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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.