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Finding the Fourth Proportional to 842.39, 1,162.49 and 469.38

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Solution

The fourth proportional to 842.39, 1,162.49 and 469.38 is: 647.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.39 : 1,162.49 = 469.38 : x
  2. Step 2: Convert to fraction form
    842.39/1,162.49 = 469.38/x
  3. Step 3: Cross multiply
    842.39x = 1,162.49 × 469.38
  4. Step 4: Simplify right side
    842.39x = 545,649.56
  5. Step 5: Solve for x
    x = 545,649.56/842.39
  6. Step 6: Final answer
    x = 647.74

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1.5x scale

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.