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Finding the Fourth Proportional to 818.78, 1,228.95 and 545.07

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Solution

The fourth proportional to 818.78, 1,228.95 and 545.07 is: 818.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.78 : 1,228.95 = 545.07 : x
  2. Step 2: Convert to fraction form
    818.78/1,228.95 = 545.07/x
  3. Step 3: Cross multiply
    818.78x = 1,228.95 × 545.07
  4. Step 4: Simplify right side
    818.78x = 669,856.48
  5. Step 5: Solve for x
    x = 669,856.48/818.78
  6. Step 6: Final answer
    x = 818.11

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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.