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Finding the Fourth Proportional to 906.18, 1,249.29 and 678.86

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Solution

The fourth proportional to 906.18, 1,249.29 and 678.86 is: 935.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.18 : 1,249.29 = 678.86 : x
  2. Step 2: Convert to fraction form
    906.18/1,249.29 = 678.86/x
  3. Step 3: Cross multiply
    906.18x = 1,249.29 × 678.86
  4. Step 4: Simplify right side
    906.18x = 848,086.76
  5. Step 5: Solve for x
    x = 848,086.76/906.18
  6. Step 6: Final answer
    x = 935.89

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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.