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Finding the Fourth Proportional to 959.76, 1,439.64 and 890.64

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Solution

The fourth proportional to 959.76, 1,439.64 and 890.64 is: 1,335.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.76 : 1,439.64 = 890.64 : x
  2. Step 2: Convert to fraction form
    959.76/1,439.64 = 890.64/x
  3. Step 3: Cross multiply
    959.76x = 1,439.64 × 890.64
  4. Step 4: Simplify right side
    959.76x = 1,282,200.97
  5. Step 5: Solve for x
    x = 1,282,200.97/959.76
  6. Step 6: Final answer
    x = 1,335.96

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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.