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Finding the Fourth Proportional to 545.50, 817.71 and 256.42

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Solution

The fourth proportional to 545.50, 817.71 and 256.42 is: 384.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.50 : 817.71 = 256.42 : x
  2. Step 2: Convert to fraction form
    545.50/817.71 = 256.42/x
  3. Step 3: Cross multiply
    545.50x = 817.71 × 256.42
  4. Step 4: Simplify right side
    545.50x = 209,677.20
  5. Step 5: Solve for x
    x = 209,677.20/545.50
  6. Step 6: Final answer
    x = 384.38

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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.