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Finding the Fourth Proportional to 829.08, 1,143.72 and 718.38

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Solution

The fourth proportional to 829.08, 1,143.72 and 718.38 is: 991.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.08 : 1,143.72 = 718.38 : x
  2. Step 2: Convert to fraction form
    829.08/1,143.72 = 718.38/x
  3. Step 3: Cross multiply
    829.08x = 1,143.72 × 718.38
  4. Step 4: Simplify right side
    829.08x = 821,625.57
  5. Step 5: Solve for x
    x = 821,625.57/829.08
  6. Step 6: Final answer
    x = 991.01

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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.