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Finding the Fourth Proportional to 2,390.16, 3,585.44 and 909

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Solution

The fourth proportional to 2,390.16, 3,585.44 and 909 is: 1,363.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.16 : 3,585.44 = 909 : x
  2. Step 2: Convert to fraction form
    2,390.16/3,585.44 = 909/x
  3. Step 3: Cross multiply
    2,390.16x = 3,585.44 × 909
  4. Step 4: Simplify right side
    2,390.16x = 3,259,164.96
  5. Step 5: Solve for x
    x = 3,259,164.96/2,390.16
  6. Step 6: Final answer
    x = 1,363.58

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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.