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Finding the Fourth Proportional to 803.27, 1,203.53 and 438.31

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Solution

The fourth proportional to 803.27, 1,203.53 and 438.31 is: 656.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.27 : 1,203.53 = 438.31 : x
  2. Step 2: Convert to fraction form
    803.27/1,203.53 = 438.31/x
  3. Step 3: Cross multiply
    803.27x = 1,203.53 × 438.31
  4. Step 4: Simplify right side
    803.27x = 527,518.55
  5. Step 5: Solve for x
    x = 527,518.55/803.27
  6. Step 6: Final answer
    x = 656.72

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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.