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Finding the Fourth Proportional to 261.63, 392.45 and 79.03

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Solution

The fourth proportional to 261.63, 392.45 and 79.03 is: 118.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.63 : 392.45 = 79.03 : x
  2. Step 2: Convert to fraction form
    261.63/392.45 = 79.03/x
  3. Step 3: Cross multiply
    261.63x = 392.45 × 79.03
  4. Step 4: Simplify right side
    261.63x = 31,012.97
  5. Step 5: Solve for x
    x = 31,012.97/261.63
  6. Step 6: Final answer
    x = 118.54

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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.