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Finding the Fourth Proportional to 830.56, 1,143.66 and 720.04

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Solution

The fourth proportional to 830.56, 1,143.66 and 720.04 is: 991.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.56 : 1,143.66 = 720.04 : x
  2. Step 2: Convert to fraction form
    830.56/1,143.66 = 720.04/x
  3. Step 3: Cross multiply
    830.56x = 1,143.66 × 720.04
  4. Step 4: Simplify right side
    830.56x = 823,480.95
  5. Step 5: Solve for x
    x = 823,480.95/830.56
  6. Step 6: Final answer
    x = 991.48

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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.