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Finding the Fourth Proportional to 7,170.78, 9,894.28 and 4,186.74

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Solution

The fourth proportional to 7,170.78, 9,894.28 and 4,186.74 is: 5,776.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,170.78 : 9,894.28 = 4,186.74 : x
  2. Step 2: Convert to fraction form
    7,170.78/9,894.28 = 4,186.74/x
  3. Step 3: Cross multiply
    7,170.78x = 9,894.28 × 4,186.74
  4. Step 4: Simplify right side
    7,170.78x = 41,424,744.90
  5. Step 5: Solve for x
    x = 41,424,744.90/7,170.78
  6. Step 6: Final answer
    x = 5,776.88

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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.