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Finding the Fourth Proportional to 443.47, 612.08 and 287.95

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Solution

The fourth proportional to 443.47, 612.08 and 287.95 is: 397.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.47 : 612.08 = 287.95 : x
  2. Step 2: Convert to fraction form
    443.47/612.08 = 287.95/x
  3. Step 3: Cross multiply
    443.47x = 612.08 × 287.95
  4. Step 4: Simplify right side
    443.47x = 176,248.44
  5. Step 5: Solve for x
    x = 176,248.44/443.47
  6. Step 6: Final answer
    x = 397.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.