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Finding the Fourth Proportional to 827.24, 1,239.78 and 340.16

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Solution

The fourth proportional to 827.24, 1,239.78 and 340.16 is: 509.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.24 : 1,239.78 = 340.16 : x
  2. Step 2: Convert to fraction form
    827.24/1,239.78 = 340.16/x
  3. Step 3: Cross multiply
    827.24x = 1,239.78 × 340.16
  4. Step 4: Simplify right side
    827.24x = 421,723.56
  5. Step 5: Solve for x
    x = 421,723.56/827.24
  6. Step 6: Final answer
    x = 509.80

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1.5x scale

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.