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Finding the Fourth Proportional to 1,218.66, 1,826.91 and 931.38

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Solution

The fourth proportional to 1,218.66, 1,826.91 and 931.38 is: 1,396.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.66 : 1,826.91 = 931.38 : x
  2. Step 2: Convert to fraction form
    1,218.66/1,826.91 = 931.38/x
  3. Step 3: Cross multiply
    1,218.66x = 1,826.91 × 931.38
  4. Step 4: Simplify right side
    1,218.66x = 1,701,547.44
  5. Step 5: Solve for x
    x = 1,701,547.44/1,218.66
  6. Step 6: Final answer
    x = 1,396.24

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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.