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Finding the Fourth Proportional to 8,691.93, 11,995.20 and 4,915.51

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Solution

The fourth proportional to 8,691.93, 11,995.20 and 4,915.51 is: 6,783.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.93 : 11,995.20 = 4,915.51 : x
  2. Step 2: Convert to fraction form
    8,691.93/11,995.20 = 4,915.51/x
  3. Step 3: Cross multiply
    8,691.93x = 11,995.20 × 4,915.51
  4. Step 4: Simplify right side
    8,691.93x = 58,962,525.55
  5. Step 5: Solve for x
    x = 58,962,525.55/8,691.93
  6. Step 6: Final answer
    x = 6,783.59

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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.