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Finding the Fourth Proportional to 811.64, 1,120.18 and 614.82

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Solution

The fourth proportional to 811.64, 1,120.18 and 614.82 is: 848.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.64 : 1,120.18 = 614.82 : x
  2. Step 2: Convert to fraction form
    811.64/1,120.18 = 614.82/x
  3. Step 3: Cross multiply
    811.64x = 1,120.18 × 614.82
  4. Step 4: Simplify right side
    811.64x = 688,709.07
  5. Step 5: Solve for x
    x = 688,709.07/811.64
  6. Step 6: Final answer
    x = 848.54

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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.