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Finding the Fourth Proportional to 823.47, 1,234.75 and 275.36

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Solution

The fourth proportional to 823.47, 1,234.75 and 275.36 is: 412.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.47 : 1,234.75 = 275.36 : x
  2. Step 2: Convert to fraction form
    823.47/1,234.75 = 275.36/x
  3. Step 3: Cross multiply
    823.47x = 1,234.75 × 275.36
  4. Step 4: Simplify right side
    823.47x = 340,000.76
  5. Step 5: Solve for x
    x = 340,000.76/823.47
  6. Step 6: Final answer
    x = 412.89

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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.