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Finding the Fourth Proportional to 8,987.70, 13,481.55 and 7,894.20

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Solution

The fourth proportional to 8,987.70, 13,481.55 and 7,894.20 is: 11,841.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,987.70 : 13,481.55 = 7,894.20 : x
  2. Step 2: Convert to fraction form
    8,987.70/13,481.55 = 7,894.20/x
  3. Step 3: Cross multiply
    8,987.70x = 13,481.55 × 7,894.20
  4. Step 4: Simplify right side
    8,987.70x = 106,426,052.01
  5. Step 5: Solve for x
    x = 106,426,052.01/8,987.70
  6. Step 6: Final answer
    x = 11,841.30

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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.