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Finding the Fourth Proportional to 1,280.48, 1,920.64 and 630.64

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Solution

The fourth proportional to 1,280.48, 1,920.64 and 630.64 is: 945.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.48 : 1,920.64 = 630.64 : x
  2. Step 2: Convert to fraction form
    1,280.48/1,920.64 = 630.64/x
  3. Step 3: Cross multiply
    1,280.48x = 1,920.64 × 630.64
  4. Step 4: Simplify right side
    1,280.48x = 1,211,232.41
  5. Step 5: Solve for x
    x = 1,211,232.41/1,280.48
  6. Step 6: Final answer
    x = 945.92

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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.