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Finding the Fourth Proportional to 806.31, 1,209.20 and 497.70

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Solution

The fourth proportional to 806.31, 1,209.20 and 497.70 is: 746.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.31 : 1,209.20 = 497.70 : x
  2. Step 2: Convert to fraction form
    806.31/1,209.20 = 497.70/x
  3. Step 3: Cross multiply
    806.31x = 1,209.20 × 497.70
  4. Step 4: Simplify right side
    806.31x = 601,820.08
  5. Step 5: Solve for x
    x = 601,820.08/806.31
  6. Step 6: Final answer
    x = 746.39

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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.