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Finding the Fourth Proportional to 990.36, 1,366.02 and 576.36

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Solution

The fourth proportional to 990.36, 1,366.02 and 576.36 is: 794.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.36 : 1,366.02 = 576.36 : x
  2. Step 2: Convert to fraction form
    990.36/1,366.02 = 576.36/x
  3. Step 3: Cross multiply
    990.36x = 1,366.02 × 576.36
  4. Step 4: Simplify right side
    990.36x = 787,319.29
  5. Step 5: Solve for x
    x = 787,319.29/990.36
  6. Step 6: Final answer
    x = 794.98

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Double scale
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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.