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Finding the Fourth Proportional to 2,543.40, 3,815.40 and 899.61

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Solution

The fourth proportional to 2,543.40, 3,815.40 and 899.61 is: 1,349.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,543.40 : 3,815.40 = 899.61 : x
  2. Step 2: Convert to fraction form
    2,543.40/3,815.40 = 899.61/x
  3. Step 3: Cross multiply
    2,543.40x = 3,815.40 × 899.61
  4. Step 4: Simplify right side
    2,543.40x = 3,432,348.42
  5. Step 5: Solve for x
    x = 3,432,348.42/2,543.40
  6. Step 6: Final answer
    x = 1,349.51

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Similar ratio
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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.