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Finding the Fourth Proportional to 423.17, 634.80 and 145.58

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Solution

The fourth proportional to 423.17, 634.80 and 145.58 is: 218.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.17 : 634.80 = 145.58 : x
  2. Step 2: Convert to fraction form
    423.17/634.80 = 145.58/x
  3. Step 3: Cross multiply
    423.17x = 634.80 × 145.58
  4. Step 4: Simplify right side
    423.17x = 92,411.01
  5. Step 5: Solve for x
    x = 92,411.01/423.17
  6. Step 6: Final answer
    x = 218.38

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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.