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Finding the Fourth Proportional to 290.95, 436.53 and 128.61

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Solution

The fourth proportional to 290.95, 436.53 and 128.61 is: 192.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.95 : 436.53 = 128.61 : x
  2. Step 2: Convert to fraction form
    290.95/436.53 = 128.61/x
  3. Step 3: Cross multiply
    290.95x = 436.53 × 128.61
  4. Step 4: Simplify right side
    290.95x = 56,142.12
  5. Step 5: Solve for x
    x = 56,142.12/290.95
  6. Step 6: Final answer
    x = 192.96

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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.