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Finding the Fourth Proportional to 979.92, 1,352.40 and 586.80

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Solution

The fourth proportional to 979.92, 1,352.40 and 586.80 is: 809.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.92 : 1,352.40 = 586.80 : x
  2. Step 2: Convert to fraction form
    979.92/1,352.40 = 586.80/x
  3. Step 3: Cross multiply
    979.92x = 1,352.40 × 586.80
  4. Step 4: Simplify right side
    979.92x = 793,588.32
  5. Step 5: Solve for x
    x = 793,588.32/979.92
  6. Step 6: Final answer
    x = 809.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.