Home / 5,478.31-7,560.36-3,121.21

Finding the Fourth Proportional to 5,478.31, 7,560.36 and 3,121.21

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Solution

The fourth proportional to 5,478.31, 7,560.36 and 3,121.21 is: 4,307.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,478.31 : 7,560.36 = 3,121.21 : x
  2. Step 2: Convert to fraction form
    5,478.31/7,560.36 = 3,121.21/x
  3. Step 3: Cross multiply
    5,478.31x = 7,560.36 × 3,121.21
  4. Step 4: Simplify right side
    5,478.31x = 23,597,417.83
  5. Step 5: Solve for x
    x = 23,597,417.83/5,478.31
  6. Step 6: Final answer
    x = 4,307.43

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Half scale
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Double scale
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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.