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Finding the Fourth Proportional to 8,990.76, 12,407.13 and 5,011.64

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Solution

The fourth proportional to 8,990.76, 12,407.13 and 5,011.64 is: 6,915.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.76 : 12,407.13 = 5,011.64 : x
  2. Step 2: Convert to fraction form
    8,990.76/12,407.13 = 5,011.64/x
  3. Step 3: Cross multiply
    8,990.76x = 12,407.13 × 5,011.64
  4. Step 4: Simplify right side
    8,990.76x = 62,180,006.96
  5. Step 5: Solve for x
    x = 62,180,006.96/8,990.76
  6. Step 6: Final answer
    x = 6,915.99

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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.