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Finding the Fourth Proportional to 407.60, 558.88 and 397.88

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Solution

The fourth proportional to 407.60, 558.88 and 397.88 is: 545.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.60 : 558.88 = 397.88 : x
  2. Step 2: Convert to fraction form
    407.60/558.88 = 397.88/x
  3. Step 3: Cross multiply
    407.60x = 558.88 × 397.88
  4. Step 4: Simplify right side
    407.60x = 222,367.17
  5. Step 5: Solve for x
    x = 222,367.17/407.60
  6. Step 6: Final answer
    x = 545.55

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.