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Finding the Fourth Proportional to 292.13, 438.26 and 99.75

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Solution

The fourth proportional to 292.13, 438.26 and 99.75 is: 149.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    292.13 : 438.26 = 99.75 : x
  2. Step 2: Convert to fraction form
    292.13/438.26 = 99.75/x
  3. Step 3: Cross multiply
    292.13x = 438.26 × 99.75
  4. Step 4: Simplify right side
    292.13x = 43,715.94
  5. Step 5: Solve for x
    x = 43,715.94/292.13
  6. Step 6: Final answer
    x = 149.65

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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.