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Finding the Fourth Proportional to 1,281.67, 1,921.37 and 623.18

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Solution

The fourth proportional to 1,281.67, 1,921.37 and 623.18 is: 934.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.67 : 1,921.37 = 623.18 : x
  2. Step 2: Convert to fraction form
    1,281.67/1,921.37 = 623.18/x
  3. Step 3: Cross multiply
    1,281.67x = 1,921.37 × 623.18
  4. Step 4: Simplify right side
    1,281.67x = 1,197,361.04
  5. Step 5: Solve for x
    x = 1,197,361.04/1,281.67
  6. Step 6: Final answer
    x = 934.22

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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.