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Finding the Fourth Proportional to 1,121.05, 1,547 and 623.73

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Solution

The fourth proportional to 1,121.05, 1,547 and 623.73 is: 860.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.05 : 1,547 = 623.73 : x
  2. Step 2: Convert to fraction form
    1,121.05/1,547 = 623.73/x
  3. Step 3: Cross multiply
    1,121.05x = 1,547 × 623.73
  4. Step 4: Simplify right side
    1,121.05x = 964,910.31
  5. Step 5: Solve for x
    x = 964,910.31/1,121.05
  6. Step 6: Final answer
    x = 860.72

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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.