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Finding the Fourth Proportional to 487.70, 672.74 and 455.30

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Solution

The fourth proportional to 487.70, 672.74 and 455.30 is: 628.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.70 : 672.74 = 455.30 : x
  2. Step 2: Convert to fraction form
    487.70/672.74 = 455.30/x
  3. Step 3: Cross multiply
    487.70x = 672.74 × 455.30
  4. Step 4: Simplify right side
    487.70x = 306,298.52
  5. Step 5: Solve for x
    x = 306,298.52/487.70
  6. Step 6: Final answer
    x = 628.05

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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.