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Finding the Fourth Proportional to 979.38, 1,467.45 and 690.21

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Solution

The fourth proportional to 979.38, 1,467.45 and 690.21 is: 1,034.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.38 : 1,467.45 = 690.21 : x
  2. Step 2: Convert to fraction form
    979.38/1,467.45 = 690.21/x
  3. Step 3: Cross multiply
    979.38x = 1,467.45 × 690.21
  4. Step 4: Simplify right side
    979.38x = 1,012,848.66
  5. Step 5: Solve for x
    x = 1,012,848.66/979.38
  6. Step 6: Final answer
    x = 1,034.17

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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.