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Finding the Fourth Proportional to 990.36, 1,365.90 and 576.12

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Solution

The fourth proportional to 990.36, 1,365.90 and 576.12 is: 794.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.36 : 1,365.90 = 576.12 : x
  2. Step 2: Convert to fraction form
    990.36/1,365.90 = 576.12/x
  3. Step 3: Cross multiply
    990.36x = 1,365.90 × 576.12
  4. Step 4: Simplify right side
    990.36x = 786,922.31
  5. Step 5: Solve for x
    x = 786,922.31/990.36
  6. Step 6: Final answer
    x = 794.58

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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.