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Finding the Fourth Proportional to 678.24, 1,015.20 and 550.08

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Solution

The fourth proportional to 678.24, 1,015.20 and 550.08 is: 823.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.24 : 1,015.20 = 550.08 : x
  2. Step 2: Convert to fraction form
    678.24/1,015.20 = 550.08/x
  3. Step 3: Cross multiply
    678.24x = 1,015.20 × 550.08
  4. Step 4: Simplify right side
    678.24x = 558,441.22
  5. Step 5: Solve for x
    x = 558,441.22/678.24
  6. Step 6: Final answer
    x = 823.37

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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.