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Finding the Fourth Proportional to 291, 436.20 and 128.52

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Solution

The fourth proportional to 291, 436.20 and 128.52 is: 192.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    291 : 436.20 = 128.52 : x
  2. Step 2: Convert to fraction form
    291/436.20 = 128.52/x
  3. Step 3: Cross multiply
    291x = 436.20 × 128.52
  4. Step 4: Simplify right side
    291x = 56,060.42
  5. Step 5: Solve for x
    x = 56,060.42/291
  6. Step 6: Final answer
    x = 192.65

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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.