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Finding the Fourth Proportional to 802.76, 1,205.68 and 665.84

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Solution

The fourth proportional to 802.76, 1,205.68 and 665.84 is: 1,000.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.76 : 1,205.68 = 665.84 : x
  2. Step 2: Convert to fraction form
    802.76/1,205.68 = 665.84/x
  3. Step 3: Cross multiply
    802.76x = 1,205.68 × 665.84
  4. Step 4: Simplify right side
    802.76x = 802,789.97
  5. Step 5: Solve for x
    x = 802,789.97/802.76
  6. Step 6: Final answer
    x = 1,000.04

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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.