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Finding the Fourth Proportional to 1,281.75, 1,921.44 and 623.22

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Solution

The fourth proportional to 1,281.75, 1,921.44 and 623.22 is: 934.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.75 : 1,921.44 = 623.22 : x
  2. Step 2: Convert to fraction form
    1,281.75/1,921.44 = 623.22/x
  3. Step 3: Cross multiply
    1,281.75x = 1,921.44 × 623.22
  4. Step 4: Simplify right side
    1,281.75x = 1,197,479.84
  5. Step 5: Solve for x
    x = 1,197,479.84/1,281.75
  6. Step 6: Final answer
    x = 934.25

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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.