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Finding the Fourth Proportional to 990.55, 1,482.31 and 729.93

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Solution

The fourth proportional to 990.55, 1,482.31 and 729.93 is: 1,092.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.55 : 1,482.31 = 729.93 : x
  2. Step 2: Convert to fraction form
    990.55/1,482.31 = 729.93/x
  3. Step 3: Cross multiply
    990.55x = 1,482.31 × 729.93
  4. Step 4: Simplify right side
    990.55x = 1,081,982.54
  5. Step 5: Solve for x
    x = 1,081,982.54/990.55
  6. Step 6: Final answer
    x = 1,092.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.