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Finding the Fourth Proportional to 5,458.40, 8,189.40 and 1,761.20

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Solution

The fourth proportional to 5,458.40, 8,189.40 and 1,761.20 is: 2,642.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,458.40 : 8,189.40 = 1,761.20 : x
  2. Step 2: Convert to fraction form
    5,458.40/8,189.40 = 1,761.20/x
  3. Step 3: Cross multiply
    5,458.40x = 8,189.40 × 1,761.20
  4. Step 4: Simplify right side
    5,458.40x = 14,423,171.28
  5. Step 5: Solve for x
    x = 14,423,171.28/5,458.40
  6. Step 6: Final answer
    x = 2,642.38

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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.