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Finding the Fourth Proportional to 8,531.10, 12,774.75 and 7,218.90

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Solution

The fourth proportional to 8,531.10, 12,774.75 and 7,218.90 is: 10,809.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,531.10 : 12,774.75 = 7,218.90 : x
  2. Step 2: Convert to fraction form
    8,531.10/12,774.75 = 7,218.90/x
  3. Step 3: Cross multiply
    8,531.10x = 12,774.75 × 7,218.90
  4. Step 4: Simplify right side
    8,531.10x = 92,219,642.78
  5. Step 5: Solve for x
    x = 92,219,642.78/8,531.10
  6. Step 6: Final answer
    x = 10,809.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.