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Finding the Fourth Proportional to 889.10, 1,227.12 and 678.88

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Solution

The fourth proportional to 889.10, 1,227.12 and 678.88 is: 936.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.10 : 1,227.12 = 678.88 : x
  2. Step 2: Convert to fraction form
    889.10/1,227.12 = 678.88/x
  3. Step 3: Cross multiply
    889.10x = 1,227.12 × 678.88
  4. Step 4: Simplify right side
    889.10x = 833,067.23
  5. Step 5: Solve for x
    x = 833,067.23/889.10
  6. Step 6: Final answer
    x = 936.98

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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.