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Finding the Fourth Proportional to 1,121.23, 1,547.32 and 623.90

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Solution

The fourth proportional to 1,121.23, 1,547.32 and 623.90 is: 860.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.23 : 1,547.32 = 623.90 : x
  2. Step 2: Convert to fraction form
    1,121.23/1,547.32 = 623.90/x
  3. Step 3: Cross multiply
    1,121.23x = 1,547.32 × 623.90
  4. Step 4: Simplify right side
    1,121.23x = 965,367.44
  5. Step 5: Solve for x
    x = 965,367.44/1,121.23
  6. Step 6: Final answer
    x = 860.99

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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.