Home / 8,687.28-11,988.72-4,911.12

Finding the Fourth Proportional to 8,687.28, 11,988.72 and 4,911.12

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Solution

The fourth proportional to 8,687.28, 11,988.72 and 4,911.12 is: 6,777.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.28 : 11,988.72 = 4,911.12 : x
  2. Step 2: Convert to fraction form
    8,687.28/11,988.72 = 4,911.12/x
  3. Step 3: Cross multiply
    8,687.28x = 11,988.72 × 4,911.12
  4. Step 4: Simplify right side
    8,687.28x = 58,878,042.57
  5. Step 5: Solve for x
    x = 58,878,042.57/8,687.28
  6. Step 6: Final answer
    x = 6,777.50

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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.