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Finding the Fourth Proportional to 869.15, 1,297.19 and 751.49

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Solution

The fourth proportional to 869.15, 1,297.19 and 751.49 is: 1,121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.15 : 1,297.19 = 751.49 : x
  2. Step 2: Convert to fraction form
    869.15/1,297.19 = 751.49/x
  3. Step 3: Cross multiply
    869.15x = 1,297.19 × 751.49
  4. Step 4: Simplify right side
    869.15x = 974,827.62
  5. Step 5: Solve for x
    x = 974,827.62/869.15
  6. Step 6: Final answer
    x = 1,121.59

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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.