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Finding the Fourth Proportional to 8,987.74, 12,402.80 and 5,008.60

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Solution

The fourth proportional to 8,987.74, 12,402.80 and 5,008.60 is: 6,911.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,987.74 : 12,402.80 = 5,008.60 : x
  2. Step 2: Convert to fraction form
    8,987.74/12,402.80 = 5,008.60/x
  3. Step 3: Cross multiply
    8,987.74x = 12,402.80 × 5,008.60
  4. Step 4: Simplify right side
    8,987.74x = 62,120,664.08
  5. Step 5: Solve for x
    x = 62,120,664.08/8,987.74
  6. Step 6: Final answer
    x = 6,911.71

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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.