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Finding the Fourth Proportional to 12,990.87, 17,915.45 and 8,512.99

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Solution

The fourth proportional to 12,990.87, 17,915.45 and 8,512.99 is: 11,740.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.87 : 17,915.45 = 8,512.99 : x
  2. Step 2: Convert to fraction form
    12,990.87/17,915.45 = 8,512.99/x
  3. Step 3: Cross multiply
    12,990.87x = 17,915.45 × 8,512.99
  4. Step 4: Simplify right side
    12,990.87x = 152,513,959.34
  5. Step 5: Solve for x
    x = 152,513,959.34/12,990.87
  6. Step 6: Final answer
    x = 11,740.09

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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.