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Finding the Fourth Proportional to 15,881.95, 21,915.79 and 8,711.74

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Solution

The fourth proportional to 15,881.95, 21,915.79 and 8,711.74 is: 12,021.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.95 : 21,915.79 = 8,711.74 : x
  2. Step 2: Convert to fraction form
    15,881.95/21,915.79 = 8,711.74/x
  3. Step 3: Cross multiply
    15,881.95x = 21,915.79 × 8,711.74
  4. Step 4: Simplify right side
    15,881.95x = 190,924,664.37
  5. Step 5: Solve for x
    x = 190,924,664.37/15,881.95
  6. Step 6: Final answer
    x = 12,021.49

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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.