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Finding the Fourth Proportional to 854.62, 1,178.92 and 571.53

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Solution

The fourth proportional to 854.62, 1,178.92 and 571.53 is: 788.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.62 : 1,178.92 = 571.53 : x
  2. Step 2: Convert to fraction form
    854.62/1,178.92 = 571.53/x
  3. Step 3: Cross multiply
    854.62x = 1,178.92 × 571.53
  4. Step 4: Simplify right side
    854.62x = 673,779.40
  5. Step 5: Solve for x
    x = 673,779.40/854.62
  6. Step 6: Final answer
    x = 788.40

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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.