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Finding the Fourth Proportional to 290,291.12, 435,452.90 and 90,639.08

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Solution

The fourth proportional to 290,291.12, 435,452.90 and 90,639.08 is: 135,963.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,291.12 : 435,452.90 = 90,639.08 : x
  2. Step 2: Convert to fraction form
    290,291.12/435,452.90 = 90,639.08/x
  3. Step 3: Cross multiply
    290,291.12x = 435,452.90 × 90,639.08
  4. Step 4: Simplify right side
    290,291.12x = 39,469,050,239.33
  5. Step 5: Solve for x
    x = 39,469,050,239.33/290,291.12
  6. Step 6: Final answer
    x = 135,963.68

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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.