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Finding the Fourth Proportional to 20,912.76, 28,831.68 and 17,915.76

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Solution

The fourth proportional to 20,912.76, 28,831.68 and 17,915.76 is: 24,699.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.76 : 28,831.68 = 17,915.76 : x
  2. Step 2: Convert to fraction form
    20,912.76/28,831.68 = 17,915.76/x
  3. Step 3: Cross multiply
    20,912.76x = 28,831.68 × 17,915.76
  4. Step 4: Simplify right side
    20,912.76x = 516,541,459.28
  5. Step 5: Solve for x
    x = 516,541,459.28/20,912.76
  6. Step 6: Final answer
    x = 24,699.82

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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.