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Finding the Fourth Proportional to 990.70, 1,367.15 and 571.05

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Solution

The fourth proportional to 990.70, 1,367.15 and 571.05 is: 788.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.70 : 1,367.15 = 571.05 : x
  2. Step 2: Convert to fraction form
    990.70/1,367.15 = 571.05/x
  3. Step 3: Cross multiply
    990.70x = 1,367.15 × 571.05
  4. Step 4: Simplify right side
    990.70x = 780,708.15
  5. Step 5: Solve for x
    x = 780,708.15/990.70
  6. Step 6: Final answer
    x = 788.04

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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.