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Finding the Fourth Proportional to 858.48, 1,287.74 and 242.24

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Solution

The fourth proportional to 858.48, 1,287.74 and 242.24 is: 363.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.48 : 1,287.74 = 242.24 : x
  2. Step 2: Convert to fraction form
    858.48/1,287.74 = 242.24/x
  3. Step 3: Cross multiply
    858.48x = 1,287.74 × 242.24
  4. Step 4: Simplify right side
    858.48x = 311,942.14
  5. Step 5: Solve for x
    x = 311,942.14/858.48
  6. Step 6: Final answer
    x = 363.37

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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.