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Finding the Fourth Proportional to 290.40, 435.24 and 127.92

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Solution

The fourth proportional to 290.40, 435.24 and 127.92 is: 191.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.40 : 435.24 = 127.92 : x
  2. Step 2: Convert to fraction form
    290.40/435.24 = 127.92/x
  3. Step 3: Cross multiply
    290.40x = 435.24 × 127.92
  4. Step 4: Simplify right side
    290.40x = 55,675.90
  5. Step 5: Solve for x
    x = 55,675.90/290.40
  6. Step 6: Final answer
    x = 191.72

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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.