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Finding the Fourth Proportional to 800.89, 1,103.98 and 631.70

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Solution

The fourth proportional to 800.89, 1,103.98 and 631.70 is: 870.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.89 : 1,103.98 = 631.70 : x
  2. Step 2: Convert to fraction form
    800.89/1,103.98 = 631.70/x
  3. Step 3: Cross multiply
    800.89x = 1,103.98 × 631.70
  4. Step 4: Simplify right side
    800.89x = 697,382.39
  5. Step 5: Solve for x
    x = 697,382.39/800.89
  6. Step 6: Final answer
    x = 870.76

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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.