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Finding the Fourth Proportional to 990.91, 1,483.39 and 643.24

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Solution

The fourth proportional to 990.91, 1,483.39 and 643.24 is: 962.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.91 : 1,483.39 = 643.24 : x
  2. Step 2: Convert to fraction form
    990.91/1,483.39 = 643.24/x
  3. Step 3: Cross multiply
    990.91x = 1,483.39 × 643.24
  4. Step 4: Simplify right side
    990.91x = 954,175.78
  5. Step 5: Solve for x
    x = 954,175.78/990.91
  6. Step 6: Final answer
    x = 962.93

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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.