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Finding the Fourth Proportional to 811.15, 1,118.96 and 614.32

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Solution

The fourth proportional to 811.15, 1,118.96 and 614.32 is: 847.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.15 : 1,118.96 = 614.32 : x
  2. Step 2: Convert to fraction form
    811.15/1,118.96 = 614.32/x
  3. Step 3: Cross multiply
    811.15x = 1,118.96 × 614.32
  4. Step 4: Simplify right side
    811.15x = 687,399.51
  5. Step 5: Solve for x
    x = 687,399.51/811.15
  6. Step 6: Final answer
    x = 847.44

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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.