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Finding the Fourth Proportional to 911.88, 1,370.52 and 479.52

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Solution

The fourth proportional to 911.88, 1,370.52 and 479.52 is: 720.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.88 : 1,370.52 = 479.52 : x
  2. Step 2: Convert to fraction form
    911.88/1,370.52 = 479.52/x
  3. Step 3: Cross multiply
    911.88x = 1,370.52 × 479.52
  4. Step 4: Simplify right side
    911.88x = 657,191.75
  5. Step 5: Solve for x
    x = 657,191.75/911.88
  6. Step 6: Final answer
    x = 720.70

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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.