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Finding the Fourth Proportional to 815.13, 1,123.70 and 581.85

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Solution

The fourth proportional to 815.13, 1,123.70 and 581.85 is: 802.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.13 : 1,123.70 = 581.85 : x
  2. Step 2: Convert to fraction form
    815.13/1,123.70 = 581.85/x
  3. Step 3: Cross multiply
    815.13x = 1,123.70 × 581.85
  4. Step 4: Simplify right side
    815.13x = 653,824.85
  5. Step 5: Solve for x
    x = 653,824.85/815.13
  6. Step 6: Final answer
    x = 802.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.