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Finding the Fourth Proportional to 884.19, 1,218.92 and 621.39

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Solution

The fourth proportional to 884.19, 1,218.92 and 621.39 is: 856.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.19 : 1,218.92 = 621.39 : x
  2. Step 2: Convert to fraction form
    884.19/1,218.92 = 621.39/x
  3. Step 3: Cross multiply
    884.19x = 1,218.92 × 621.39
  4. Step 4: Simplify right side
    884.19x = 757,421.59
  5. Step 5: Solve for x
    x = 757,421.59/884.19
  6. Step 6: Final answer
    x = 856.63

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Double scale
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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.