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Finding the Fourth Proportional to 1,224.35, 1,687.33 and 870.28

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Solution

The fourth proportional to 1,224.35, 1,687.33 and 870.28 is: 1,199.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.35 : 1,687.33 = 870.28 : x
  2. Step 2: Convert to fraction form
    1,224.35/1,687.33 = 870.28/x
  3. Step 3: Cross multiply
    1,224.35x = 1,687.33 × 870.28
  4. Step 4: Simplify right side
    1,224.35x = 1,468,446.42
  5. Step 5: Solve for x
    x = 1,468,446.42/1,224.35
  6. Step 6: Final answer
    x = 1,199.37

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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.