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Finding the Fourth Proportional to 815.58, 1,123.95 and 800.58

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Solution

The fourth proportional to 815.58, 1,123.95 and 800.58 is: 1,103.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.58 : 1,123.95 = 800.58 : x
  2. Step 2: Convert to fraction form
    815.58/1,123.95 = 800.58/x
  3. Step 3: Cross multiply
    815.58x = 1,123.95 × 800.58
  4. Step 4: Simplify right side
    815.58x = 899,812.35
  5. Step 5: Solve for x
    x = 899,812.35/815.58
  6. Step 6: Final answer
    x = 1,103.28

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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.