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Finding the Fourth Proportional to 979.29, 1,469.15 and 459.01

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Solution

The fourth proportional to 979.29, 1,469.15 and 459.01 is: 688.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.29 : 1,469.15 = 459.01 : x
  2. Step 2: Convert to fraction form
    979.29/1,469.15 = 459.01/x
  3. Step 3: Cross multiply
    979.29x = 1,469.15 × 459.01
  4. Step 4: Simplify right side
    979.29x = 674,352.02
  5. Step 5: Solve for x
    x = 674,352.02/979.29
  6. Step 6: Final answer
    x = 688.61

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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.