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Finding the Fourth Proportional to 3,148.47, 4,722.72 and 839.97

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Solution

The fourth proportional to 3,148.47, 4,722.72 and 839.97 is: 1,259.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,148.47 : 4,722.72 = 839.97 : x
  2. Step 2: Convert to fraction form
    3,148.47/4,722.72 = 839.97/x
  3. Step 3: Cross multiply
    3,148.47x = 4,722.72 × 839.97
  4. Step 4: Simplify right side
    3,148.47x = 3,966,943.12
  5. Step 5: Solve for x
    x = 3,966,943.12/3,148.47
  6. Step 6: Final answer
    x = 1,259.96

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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.