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Finding the Fourth Proportional to 867.29, 1,292.85 and 830.84

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Solution

The fourth proportional to 867.29, 1,292.85 and 830.84 is: 1,238.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.29 : 1,292.85 = 830.84 : x
  2. Step 2: Convert to fraction form
    867.29/1,292.85 = 830.84/x
  3. Step 3: Cross multiply
    867.29x = 1,292.85 × 830.84
  4. Step 4: Simplify right side
    867.29x = 1,074,145.03
  5. Step 5: Solve for x
    x = 1,074,145.03/867.29
  6. Step 6: Final answer
    x = 1,238.51

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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.