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Finding the Fourth Proportional to 990.38, 1,482.47 and 661.58

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Solution

The fourth proportional to 990.38, 1,482.47 and 661.58 is: 990.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.38 : 1,482.47 = 661.58 : x
  2. Step 2: Convert to fraction form
    990.38/1,482.47 = 661.58/x
  3. Step 3: Cross multiply
    990.38x = 1,482.47 × 661.58
  4. Step 4: Simplify right side
    990.38x = 980,772.50
  5. Step 5: Solve for x
    x = 980,772.50/990.38
  6. Step 6: Final answer
    x = 990.30

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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.