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Finding the Fourth Proportional to 290.98, 436.78 and 117.76

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Solution

The fourth proportional to 290.98, 436.78 and 117.76 is: 176.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.98 : 436.78 = 117.76 : x
  2. Step 2: Convert to fraction form
    290.98/436.78 = 117.76/x
  3. Step 3: Cross multiply
    290.98x = 436.78 × 117.76
  4. Step 4: Simplify right side
    290.98x = 51,435.21
  5. Step 5: Solve for x
    x = 51,435.21/290.98
  6. Step 6: Final answer
    x = 176.77

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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.