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Finding the Fourth Proportional to 8,990.75, 12,407.40 and 5,011.44

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Solution

The fourth proportional to 8,990.75, 12,407.40 and 5,011.44 is: 6,915.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.75 : 12,407.40 = 5,011.44 : x
  2. Step 2: Convert to fraction form
    8,990.75/12,407.40 = 5,011.44/x
  3. Step 3: Cross multiply
    8,990.75x = 12,407.40 × 5,011.44
  4. Step 4: Simplify right side
    8,990.75x = 62,178,940.66
  5. Step 5: Solve for x
    x = 62,178,940.66/8,990.75
  6. Step 6: Final answer
    x = 6,915.88

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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.