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Finding the Fourth Proportional to 990.25, 1,366.91 and 576.25

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Solution

The fourth proportional to 990.25, 1,366.91 and 576.25 is: 795.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.25 : 1,366.91 = 576.25 : x
  2. Step 2: Convert to fraction form
    990.25/1,366.91 = 576.25/x
  3. Step 3: Cross multiply
    990.25x = 1,366.91 × 576.25
  4. Step 4: Simplify right side
    990.25x = 787,679.01
  5. Step 5: Solve for x
    x = 787,679.01/990.25
  6. Step 6: Final answer
    x = 795.43

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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.