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Finding the Fourth Proportional to 8,985.45, 12,400.42 and 5,401.52

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Solution

The fourth proportional to 8,985.45, 12,400.42 and 5,401.52 is: 7,454.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,985.45 : 12,400.42 = 5,401.52 : x
  2. Step 2: Convert to fraction form
    8,985.45/12,400.42 = 5,401.52/x
  3. Step 3: Cross multiply
    8,985.45x = 12,400.42 × 5,401.52
  4. Step 4: Simplify right side
    8,985.45x = 66,981,054.64
  5. Step 5: Solve for x
    x = 66,981,054.64/8,985.45
  6. Step 6: Final answer
    x = 7,454.39

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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.