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Finding the Fourth Proportional to 873.78, 1,311.78 and 545.22

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Solution

The fourth proportional to 873.78, 1,311.78 and 545.22 is: 818.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.78 : 1,311.78 = 545.22 : x
  2. Step 2: Convert to fraction form
    873.78/1,311.78 = 545.22/x
  3. Step 3: Cross multiply
    873.78x = 1,311.78 × 545.22
  4. Step 4: Simplify right side
    873.78x = 715,208.69
  5. Step 5: Solve for x
    x = 715,208.69/873.78
  6. Step 6: Final answer
    x = 818.52

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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.