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Finding the Fourth Proportional to 3,425.60, 5,139.60 and 1,478.40

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Solution

The fourth proportional to 3,425.60, 5,139.60 and 1,478.40 is: 2,218.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,425.60 : 5,139.60 = 1,478.40 : x
  2. Step 2: Convert to fraction form
    3,425.60/5,139.60 = 1,478.40/x
  3. Step 3: Cross multiply
    3,425.60x = 5,139.60 × 1,478.40
  4. Step 4: Simplify right side
    3,425.60x = 7,598,384.64
  5. Step 5: Solve for x
    x = 7,598,384.64/3,425.60
  6. Step 6: Final answer
    x = 2,218.12

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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.