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Finding the Fourth Proportional to 711.20, 1,068.40 and 495.20

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Solution

The fourth proportional to 711.20, 1,068.40 and 495.20 is: 743.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.20 : 1,068.40 = 495.20 : x
  2. Step 2: Convert to fraction form
    711.20/1,068.40 = 495.20/x
  3. Step 3: Cross multiply
    711.20x = 1,068.40 × 495.20
  4. Step 4: Simplify right side
    711.20x = 529,071.68
  5. Step 5: Solve for x
    x = 529,071.68/711.20
  6. Step 6: Final answer
    x = 743.91

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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.