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Finding the Fourth Proportional to 15,002.70, 20,688.17 and 12,885.23

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Solution

The fourth proportional to 15,002.70, 20,688.17 and 12,885.23 is: 17,768.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,002.70 : 20,688.17 = 12,885.23 : x
  2. Step 2: Convert to fraction form
    15,002.70/20,688.17 = 12,885.23/x
  3. Step 3: Cross multiply
    15,002.70x = 20,688.17 × 12,885.23
  4. Step 4: Simplify right side
    15,002.70x = 266,571,660.86
  5. Step 5: Solve for x
    x = 266,571,660.86/15,002.70
  6. Step 6: Final answer
    x = 17,768.25

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Double scale
Find fourth proportional to 15,003.70, 20,689.54 and 12,886.23
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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.