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Finding the Fourth Proportional to 854.15, 1,280.75 and 545.81

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Solution

The fourth proportional to 854.15, 1,280.75 and 545.81 is: 818.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.15 : 1,280.75 = 545.81 : x
  2. Step 2: Convert to fraction form
    854.15/1,280.75 = 545.81/x
  3. Step 3: Cross multiply
    854.15x = 1,280.75 × 545.81
  4. Step 4: Simplify right side
    854.15x = 699,050.72
  5. Step 5: Solve for x
    x = 699,050.72/854.15
  6. Step 6: Final answer
    x = 818.41

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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.