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Finding the Fourth Proportional to 961.20, 1,440.90 and 384.48

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Solution

The fourth proportional to 961.20, 1,440.90 and 384.48 is: 576.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.20 : 1,440.90 = 384.48 : x
  2. Step 2: Convert to fraction form
    961.20/1,440.90 = 384.48/x
  3. Step 3: Cross multiply
    961.20x = 1,440.90 × 384.48
  4. Step 4: Simplify right side
    961.20x = 553,997.23
  5. Step 5: Solve for x
    x = 553,997.23/961.20
  6. Step 6: Final answer
    x = 576.36

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Double scale
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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.