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Finding the Fourth Proportional to 8,539.70, 12,809.55 and 7,515.70

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Solution

The fourth proportional to 8,539.70, 12,809.55 and 7,515.70 is: 11,273.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,539.70 : 12,809.55 = 7,515.70 : x
  2. Step 2: Convert to fraction form
    8,539.70/12,809.55 = 7,515.70/x
  3. Step 3: Cross multiply
    8,539.70x = 12,809.55 × 7,515.70
  4. Step 4: Simplify right side
    8,539.70x = 96,272,734.94
  5. Step 5: Solve for x
    x = 96,272,734.94/8,539.70
  6. Step 6: Final answer
    x = 11,273.55

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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.