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Finding the Fourth Proportional to 869.94, 1,305.32 and 545.54

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Solution

The fourth proportional to 869.94, 1,305.32 and 545.54 is: 818.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.94 : 1,305.32 = 545.54 : x
  2. Step 2: Convert to fraction form
    869.94/1,305.32 = 545.54/x
  3. Step 3: Cross multiply
    869.94x = 1,305.32 × 545.54
  4. Step 4: Simplify right side
    869.94x = 712,095.02
  5. Step 5: Solve for x
    x = 712,095.02/869.94
  6. Step 6: Final answer
    x = 818.56

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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.