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Finding the Fourth Proportional to 610.60, 842.40 and 400.72

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Solution

The fourth proportional to 610.60, 842.40 and 400.72 is: 552.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.60 : 842.40 = 400.72 : x
  2. Step 2: Convert to fraction form
    610.60/842.40 = 400.72/x
  3. Step 3: Cross multiply
    610.60x = 842.40 × 400.72
  4. Step 4: Simplify right side
    610.60x = 337,566.53
  5. Step 5: Solve for x
    x = 337,566.53/610.60
  6. Step 6: Final answer
    x = 552.84

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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.