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Finding the Fourth Proportional to 811.17, 1,217.61 and 400.77

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Solution

The fourth proportional to 811.17, 1,217.61 and 400.77 is: 601.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.17 : 1,217.61 = 400.77 : x
  2. Step 2: Convert to fraction form
    811.17/1,217.61 = 400.77/x
  3. Step 3: Cross multiply
    811.17x = 1,217.61 × 400.77
  4. Step 4: Simplify right side
    811.17x = 487,981.56
  5. Step 5: Solve for x
    x = 487,981.56/811.17
  6. Step 6: Final answer
    x = 601.58

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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.