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Finding the Fourth Proportional to 488.10, 672.70 and 405.21

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Solution

The fourth proportional to 488.10, 672.70 and 405.21 is: 558.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.10 : 672.70 = 405.21 : x
  2. Step 2: Convert to fraction form
    488.10/672.70 = 405.21/x
  3. Step 3: Cross multiply
    488.10x = 672.70 × 405.21
  4. Step 4: Simplify right side
    488.10x = 272,584.77
  5. Step 5: Solve for x
    x = 272,584.77/488.10
  6. Step 6: Final answer
    x = 558.46

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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.