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Finding the Fourth Proportional to 805.90, 1,209.13 and 497.34

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Solution

The fourth proportional to 805.90, 1,209.13 and 497.34 is: 746.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.90 : 1,209.13 = 497.34 : x
  2. Step 2: Convert to fraction form
    805.90/1,209.13 = 497.34/x
  3. Step 3: Cross multiply
    805.90x = 1,209.13 × 497.34
  4. Step 4: Simplify right side
    805.90x = 601,348.71
  5. Step 5: Solve for x
    x = 601,348.71/805.90
  6. Step 6: Final answer
    x = 746.18

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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.