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Finding the Fourth Proportional to 1,093.42, 1,508.66 and 621.21

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Solution

The fourth proportional to 1,093.42, 1,508.66 and 621.21 is: 857.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,093.42 : 1,508.66 = 621.21 : x
  2. Step 2: Convert to fraction form
    1,093.42/1,508.66 = 621.21/x
  3. Step 3: Cross multiply
    1,093.42x = 1,508.66 × 621.21
  4. Step 4: Simplify right side
    1,093.42x = 937,194.68
  5. Step 5: Solve for x
    x = 937,194.68/1,093.42
  6. Step 6: Final answer
    x = 857.12

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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.