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Finding the Fourth Proportional to 803.62, 1,111.62 and 672.40

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Solution

The fourth proportional to 803.62, 1,111.62 and 672.40 is: 930.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.62 : 1,111.62 = 672.40 : x
  2. Step 2: Convert to fraction form
    803.62/1,111.62 = 672.40/x
  3. Step 3: Cross multiply
    803.62x = 1,111.62 × 672.40
  4. Step 4: Simplify right side
    803.62x = 747,453.29
  5. Step 5: Solve for x
    x = 747,453.29/803.62
  6. Step 6: Final answer
    x = 930.11

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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.