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Finding the Fourth Proportional to 815.57, 1,220.59 and 491.17

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Solution

The fourth proportional to 815.57, 1,220.59 and 491.17 is: 735.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.57 : 1,220.59 = 491.17 : x
  2. Step 2: Convert to fraction form
    815.57/1,220.59 = 491.17/x
  3. Step 3: Cross multiply
    815.57x = 1,220.59 × 491.17
  4. Step 4: Simplify right side
    815.57x = 599,508.63
  5. Step 5: Solve for x
    x = 599,508.63/815.57
  6. Step 6: Final answer
    x = 735.08

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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.