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Finding the Fourth Proportional to 990.84, 1,486.28 and 260.42

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Solution

The fourth proportional to 990.84, 1,486.28 and 260.42 is: 390.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.84 : 1,486.28 = 260.42 : x
  2. Step 2: Convert to fraction form
    990.84/1,486.28 = 260.42/x
  3. Step 3: Cross multiply
    990.84x = 1,486.28 × 260.42
  4. Step 4: Simplify right side
    990.84x = 387,057.04
  5. Step 5: Solve for x
    x = 387,057.04/990.84
  6. Step 6: Final answer
    x = 390.64

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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.