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Finding the Fourth Proportional to 290,215.59, 435,326.09 and 87,813.29

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Solution

The fourth proportional to 290,215.59, 435,326.09 and 87,813.29 is: 131,720.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,215.59 : 435,326.09 = 87,813.29 : x
  2. Step 2: Convert to fraction form
    290,215.59/435,326.09 = 87,813.29/x
  3. Step 3: Cross multiply
    290,215.59x = 435,326.09 × 87,813.29
  4. Step 4: Simplify right side
    290,215.59x = 38,227,413,570.04
  5. Step 5: Solve for x
    x = 38,227,413,570.04/290,215.59
  6. Step 6: Final answer
    x = 131,720.74

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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.