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Finding the Fourth Proportional to 991.89, 1,488.69 and 472.14

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Solution

The fourth proportional to 991.89, 1,488.69 and 472.14 is: 708.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.89 : 1,488.69 = 472.14 : x
  2. Step 2: Convert to fraction form
    991.89/1,488.69 = 472.14/x
  3. Step 3: Cross multiply
    991.89x = 1,488.69 × 472.14
  4. Step 4: Simplify right side
    991.89x = 702,870.10
  5. Step 5: Solve for x
    x = 702,870.10/991.89
  6. Step 6: Final answer
    x = 708.62

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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.