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Finding the Fourth Proportional to 910.44, 1,254.78 and 688.86

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Solution

The fourth proportional to 910.44, 1,254.78 and 688.86 is: 949.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.44 : 1,254.78 = 688.86 : x
  2. Step 2: Convert to fraction form
    910.44/1,254.78 = 688.86/x
  3. Step 3: Cross multiply
    910.44x = 1,254.78 × 688.86
  4. Step 4: Simplify right side
    910.44x = 864,367.75
  5. Step 5: Solve for x
    x = 864,367.75/910.44
  6. Step 6: Final answer
    x = 949.40

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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.