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Finding the Fourth Proportional to 867.08, 1,290.41 and 836.36

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Solution

The fourth proportional to 867.08, 1,290.41 and 836.36 is: 1,244.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.08 : 1,290.41 = 836.36 : x
  2. Step 2: Convert to fraction form
    867.08/1,290.41 = 836.36/x
  3. Step 3: Cross multiply
    867.08x = 1,290.41 × 836.36
  4. Step 4: Simplify right side
    867.08x = 1,079,247.31
  5. Step 5: Solve for x
    x = 1,079,247.31/867.08
  6. Step 6: Final answer
    x = 1,244.69

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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.