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Finding the Fourth Proportional to 842.72, 1,162.97 and 469.74

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Solution

The fourth proportional to 842.72, 1,162.97 and 469.74 is: 648.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.72 : 1,162.97 = 469.74 : x
  2. Step 2: Convert to fraction form
    842.72/1,162.97 = 469.74/x
  3. Step 3: Cross multiply
    842.72x = 1,162.97 × 469.74
  4. Step 4: Simplify right side
    842.72x = 546,291.79
  5. Step 5: Solve for x
    x = 546,291.79/842.72
  6. Step 6: Final answer
    x = 648.25

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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.