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Finding the Fourth Proportional to 979.74, 1,469.61 and 354.98

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Solution

The fourth proportional to 979.74, 1,469.61 and 354.98 is: 532.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.74 : 1,469.61 = 354.98 : x
  2. Step 2: Convert to fraction form
    979.74/1,469.61 = 354.98/x
  3. Step 3: Cross multiply
    979.74x = 1,469.61 × 354.98
  4. Step 4: Simplify right side
    979.74x = 521,685.83
  5. Step 5: Solve for x
    x = 521,685.83/979.74
  6. Step 6: Final answer
    x = 532.47

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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.