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Finding the Fourth Proportional to 782.72, 1,172.97 and 535.70

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Solution

The fourth proportional to 782.72, 1,172.97 and 535.70 is: 802.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.72 : 1,172.97 = 535.70 : x
  2. Step 2: Convert to fraction form
    782.72/1,172.97 = 535.70/x
  3. Step 3: Cross multiply
    782.72x = 1,172.97 × 535.70
  4. Step 4: Simplify right side
    782.72x = 628,360.03
  5. Step 5: Solve for x
    x = 628,360.03/782.72
  6. Step 6: Final answer
    x = 802.79

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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.