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Finding the Fourth Proportional to 1,155.78, 1,595.03 and 631.85

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Solution

The fourth proportional to 1,155.78, 1,595.03 and 631.85 is: 871.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,155.78 : 1,595.03 = 631.85 : x
  2. Step 2: Convert to fraction form
    1,155.78/1,595.03 = 631.85/x
  3. Step 3: Cross multiply
    1,155.78x = 1,595.03 × 631.85
  4. Step 4: Simplify right side
    1,155.78x = 1,007,808.57
  5. Step 5: Solve for x
    x = 1,007,808.57/1,155.78
  6. Step 6: Final answer
    x = 871.97

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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.