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Finding the Fourth Proportional to 807.72, 1,211.80 and 345.52

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Solution

The fourth proportional to 807.72, 1,211.80 and 345.52 is: 518.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.72 : 1,211.80 = 345.52 : x
  2. Step 2: Convert to fraction form
    807.72/1,211.80 = 345.52/x
  3. Step 3: Cross multiply
    807.72x = 1,211.80 × 345.52
  4. Step 4: Simplify right side
    807.72x = 418,701.14
  5. Step 5: Solve for x
    x = 418,701.14/807.72
  6. Step 6: Final answer
    x = 518.37

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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.