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Finding the Fourth Proportional to 289.93, 435.11 and 145.75

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Solution

The fourth proportional to 289.93, 435.11 and 145.75 is: 218.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.93 : 435.11 = 145.75 : x
  2. Step 2: Convert to fraction form
    289.93/435.11 = 145.75/x
  3. Step 3: Cross multiply
    289.93x = 435.11 × 145.75
  4. Step 4: Simplify right side
    289.93x = 63,417.28
  5. Step 5: Solve for x
    x = 63,417.28/289.93
  6. Step 6: Final answer
    x = 218.73

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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.