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Finding the Fourth Proportional to 587.71, 811.70 and 400.88

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Solution

The fourth proportional to 587.71, 811.70 and 400.88 is: 553.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    587.71 : 811.70 = 400.88 : x
  2. Step 2: Convert to fraction form
    587.71/811.70 = 400.88/x
  3. Step 3: Cross multiply
    587.71x = 811.70 × 400.88
  4. Step 4: Simplify right side
    587.71x = 325,390.24
  5. Step 5: Solve for x
    x = 325,390.24/587.71
  6. Step 6: Final answer
    x = 553.66

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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.