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Finding the Fourth Proportional to 979.89, 1,470.57 and 517.59

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Solution

The fourth proportional to 979.89, 1,470.57 and 517.59 is: 776.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.89 : 1,470.57 = 517.59 : x
  2. Step 2: Convert to fraction form
    979.89/1,470.57 = 517.59/x
  3. Step 3: Cross multiply
    979.89x = 1,470.57 × 517.59
  4. Step 4: Simplify right side
    979.89x = 761,152.33
  5. Step 5: Solve for x
    x = 761,152.33/979.89
  6. Step 6: Final answer
    x = 776.77

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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.