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Finding the Fourth Proportional to 5,718.40, 7,884.48 and 3,947.20

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Solution

The fourth proportional to 5,718.40, 7,884.48 and 3,947.20 is: 5,442.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,718.40 : 7,884.48 = 3,947.20 : x
  2. Step 2: Convert to fraction form
    5,718.40/7,884.48 = 3,947.20/x
  3. Step 3: Cross multiply
    5,718.40x = 7,884.48 × 3,947.20
  4. Step 4: Simplify right side
    5,718.40x = 31,121,619.46
  5. Step 5: Solve for x
    x = 31,121,619.46/5,718.40
  6. Step 6: Final answer
    x = 5,442.36

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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.