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Finding the Fourth Proportional to 1,009.67, 1,393.20 and 616.82

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Solution

The fourth proportional to 1,009.67, 1,393.20 and 616.82 is: 851.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.67 : 1,393.20 = 616.82 : x
  2. Step 2: Convert to fraction form
    1,009.67/1,393.20 = 616.82/x
  3. Step 3: Cross multiply
    1,009.67x = 1,393.20 × 616.82
  4. Step 4: Simplify right side
    1,009.67x = 859,346.66
  5. Step 5: Solve for x
    x = 859,346.66/1,009.67
  6. Step 6: Final answer
    x = 851.12

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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.