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Finding the Fourth Proportional to 587.28, 811.98 and 561

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Solution

The fourth proportional to 587.28, 811.98 and 561 is: 775.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.28 : 811.98 = 561 : x
  2. Step 2: Convert to fraction form
    587.28/811.98 = 561/x
  3. Step 3: Cross multiply
    587.28x = 811.98 × 561
  4. Step 4: Simplify right side
    587.28x = 455,520.78
  5. Step 5: Solve for x
    x = 455,520.78/587.28
  6. Step 6: Final answer
    x = 775.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.