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Finding the Fourth Proportional to 448.55, 672.82 and 387.49

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Solution

The fourth proportional to 448.55, 672.82 and 387.49 is: 581.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.55 : 672.82 = 387.49 : x
  2. Step 2: Convert to fraction form
    448.55/672.82 = 387.49/x
  3. Step 3: Cross multiply
    448.55x = 672.82 × 387.49
  4. Step 4: Simplify right side
    448.55x = 260,711.02
  5. Step 5: Solve for x
    x = 260,711.02/448.55
  6. Step 6: Final answer
    x = 581.23

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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.