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Finding the Fourth Proportional to 369.72, 555 and 261.60

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Solution

The fourth proportional to 369.72, 555 and 261.60 is: 392.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.72 : 555 = 261.60 : x
  2. Step 2: Convert to fraction form
    369.72/555 = 261.60/x
  3. Step 3: Cross multiply
    369.72x = 555 × 261.60
  4. Step 4: Simplify right side
    369.72x = 145,188
  5. Step 5: Solve for x
    x = 145,188/369.72
  6. Step 6: Final answer
    x = 392.70

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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.