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Finding the Fourth Proportional to 290,639.56, 435,801.26 and 90,873.80

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Solution

The fourth proportional to 290,639.56, 435,801.26 and 90,873.80 is: 136,261.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,639.56 : 435,801.26 = 90,873.80 : x
  2. Step 2: Convert to fraction form
    290,639.56/435,801.26 = 90,873.80/x
  3. Step 3: Cross multiply
    290,639.56x = 435,801.26 × 90,873.80
  4. Step 4: Simplify right side
    290,639.56x = 39,602,916,540.99
  5. Step 5: Solve for x
    x = 39,602,916,540.99/290,639.56
  6. Step 6: Final answer
    x = 136,261.27

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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.