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Finding the Fourth Proportional to 557.72, 835 and 392.80

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Solution

The fourth proportional to 557.72, 835 and 392.80 is: 588.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.72 : 835 = 392.80 : x
  2. Step 2: Convert to fraction form
    557.72/835 = 392.80/x
  3. Step 3: Cross multiply
    557.72x = 835 × 392.80
  4. Step 4: Simplify right side
    557.72x = 327,988
  5. Step 5: Solve for x
    x = 327,988/557.72
  6. Step 6: Final answer
    x = 588.09

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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.