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Finding the Fourth Proportional to 2,289.76, 3,432.81 and 990.34

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Solution

The fourth proportional to 2,289.76, 3,432.81 and 990.34 is: 1,484.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,289.76 : 3,432.81 = 990.34 : x
  2. Step 2: Convert to fraction form
    2,289.76/3,432.81 = 990.34/x
  3. Step 3: Cross multiply
    2,289.76x = 3,432.81 × 990.34
  4. Step 4: Simplify right side
    2,289.76x = 3,399,649.06
  5. Step 5: Solve for x
    x = 3,399,649.06/2,289.76
  6. Step 6: Final answer
    x = 1,484.72

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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.