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Finding the Fourth Proportional to 487.85, 672.75 and 382.77

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Solution

The fourth proportional to 487.85, 672.75 and 382.77 is: 527.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.85 : 672.75 = 382.77 : x
  2. Step 2: Convert to fraction form
    487.85/672.75 = 382.77/x
  3. Step 3: Cross multiply
    487.85x = 672.75 × 382.77
  4. Step 4: Simplify right side
    487.85x = 257,508.52
  5. Step 5: Solve for x
    x = 257,508.52/487.85
  6. Step 6: Final answer
    x = 527.85

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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.