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Finding the Fourth Proportional to 869.94, 1,297.89 and 860.76

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Solution

The fourth proportional to 869.94, 1,297.89 and 860.76 is: 1,284.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.94 : 1,297.89 = 860.76 : x
  2. Step 2: Convert to fraction form
    869.94/1,297.89 = 860.76/x
  3. Step 3: Cross multiply
    869.94x = 1,297.89 × 860.76
  4. Step 4: Simplify right side
    869.94x = 1,117,171.80
  5. Step 5: Solve for x
    x = 1,117,171.80/869.94
  6. Step 6: Final answer
    x = 1,284.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.