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Finding the Fourth Proportional to 811.88, 1,216.95 and 534.13

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Solution

The fourth proportional to 811.88, 1,216.95 and 534.13 is: 800.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.88 : 1,216.95 = 534.13 : x
  2. Step 2: Convert to fraction form
    811.88/1,216.95 = 534.13/x
  3. Step 3: Cross multiply
    811.88x = 1,216.95 × 534.13
  4. Step 4: Simplify right side
    811.88x = 650,009.50
  5. Step 5: Solve for x
    x = 650,009.50/811.88
  6. Step 6: Final answer
    x = 800.62

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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.