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Finding the Fourth Proportional to 991.31, 1,488.05 and 414.59

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Solution

The fourth proportional to 991.31, 1,488.05 and 414.59 is: 622.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.31 : 1,488.05 = 414.59 : x
  2. Step 2: Convert to fraction form
    991.31/1,488.05 = 414.59/x
  3. Step 3: Cross multiply
    991.31x = 1,488.05 × 414.59
  4. Step 4: Simplify right side
    991.31x = 616,930.65
  5. Step 5: Solve for x
    x = 616,930.65/991.31
  6. Step 6: Final answer
    x = 622.34

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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.