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Finding the Fourth Proportional to 446.43, 615.74 and 387.31

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Solution

The fourth proportional to 446.43, 615.74 and 387.31 is: 534.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.43 : 615.74 = 387.31 : x
  2. Step 2: Convert to fraction form
    446.43/615.74 = 387.31/x
  3. Step 3: Cross multiply
    446.43x = 615.74 × 387.31
  4. Step 4: Simplify right side
    446.43x = 238,482.26
  5. Step 5: Solve for x
    x = 238,482.26/446.43
  6. Step 6: Final answer
    x = 534.20

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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.