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Finding the Fourth Proportional to 815.22, 1,125.09 and 483.75

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Solution

The fourth proportional to 815.22, 1,125.09 and 483.75 is: 667.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.22 : 1,125.09 = 483.75 : x
  2. Step 2: Convert to fraction form
    815.22/1,125.09 = 483.75/x
  3. Step 3: Cross multiply
    815.22x = 1,125.09 × 483.75
  4. Step 4: Simplify right side
    815.22x = 544,262.29
  5. Step 5: Solve for x
    x = 544,262.29/815.22
  6. Step 6: Final answer
    x = 667.63

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1.5x scale

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.