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Finding the Fourth Proportional to 803.18, 1,205.19 and 437.90

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Solution

The fourth proportional to 803.18, 1,205.19 and 437.90 is: 657.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.18 : 1,205.19 = 437.90 : x
  2. Step 2: Convert to fraction form
    803.18/1,205.19 = 437.90/x
  3. Step 3: Cross multiply
    803.18x = 1,205.19 × 437.90
  4. Step 4: Simplify right side
    803.18x = 527,752.70
  5. Step 5: Solve for x
    x = 527,752.70/803.18
  6. Step 6: Final answer
    x = 657.08

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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.