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Finding the Fourth Proportional to 574.15, 860.71 and 427.72

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Solution

The fourth proportional to 574.15, 860.71 and 427.72 is: 641.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.15 : 860.71 = 427.72 : x
  2. Step 2: Convert to fraction form
    574.15/860.71 = 427.72/x
  3. Step 3: Cross multiply
    574.15x = 860.71 × 427.72
  4. Step 4: Simplify right side
    574.15x = 368,140.74
  5. Step 5: Solve for x
    x = 368,140.74/574.15
  6. Step 6: Final answer
    x = 641.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.