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Finding the Fourth Proportional to 979.98, 1,469.95 and 517.66

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Solution

The fourth proportional to 979.98, 1,469.95 and 517.66 is: 776.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.98 : 1,469.95 = 517.66 : x
  2. Step 2: Convert to fraction form
    979.98/1,469.95 = 517.66/x
  3. Step 3: Cross multiply
    979.98x = 1,469.95 × 517.66
  4. Step 4: Simplify right side
    979.98x = 760,934.32
  5. Step 5: Solve for x
    x = 760,934.32/979.98
  6. Step 6: Final answer
    x = 776.48

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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.