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Finding the Fourth Proportional to 2,990.84, 4,487.21 and 911.24

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Solution

The fourth proportional to 2,990.84, 4,487.21 and 911.24 is: 1,367.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.84 : 4,487.21 = 911.24 : x
  2. Step 2: Convert to fraction form
    2,990.84/4,487.21 = 911.24/x
  3. Step 3: Cross multiply
    2,990.84x = 4,487.21 × 911.24
  4. Step 4: Simplify right side
    2,990.84x = 4,088,925.24
  5. Step 5: Solve for x
    x = 4,088,925.24/2,990.84
  6. Step 6: Final answer
    x = 1,367.15

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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.