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Finding the Fourth Proportional to 545.19, 816.57 and 423.09

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Solution

The fourth proportional to 545.19, 816.57 and 423.09 is: 633.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.19 : 816.57 = 423.09 : x
  2. Step 2: Convert to fraction form
    545.19/816.57 = 423.09/x
  3. Step 3: Cross multiply
    545.19x = 816.57 × 423.09
  4. Step 4: Simplify right side
    545.19x = 345,482.60
  5. Step 5: Solve for x
    x = 345,482.60/545.19
  6. Step 6: Final answer
    x = 633.69

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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.