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Finding the Fourth Proportional to 1,121.11, 1,547.11 and 623.73

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Solution

The fourth proportional to 1,121.11, 1,547.11 and 623.73 is: 860.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.11 : 1,547.11 = 623.73 : x
  2. Step 2: Convert to fraction form
    1,121.11/1,547.11 = 623.73/x
  3. Step 3: Cross multiply
    1,121.11x = 1,547.11 × 623.73
  4. Step 4: Simplify right side
    1,121.11x = 964,978.92
  5. Step 5: Solve for x
    x = 964,978.92/1,121.11
  6. Step 6: Final answer
    x = 860.74

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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.