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Finding the Fourth Proportional to 290,326.68, 435,489.85 and 90,664.17

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Solution

The fourth proportional to 290,326.68, 435,489.85 and 90,664.17 is: 135,996.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,326.68 : 435,489.85 = 90,664.17 : x
  2. Step 2: Convert to fraction form
    290,326.68/435,489.85 = 90,664.17/x
  3. Step 3: Cross multiply
    290,326.68x = 435,489.85 × 90,664.17
  4. Step 4: Simplify right side
    290,326.68x = 39,483,326,882.40
  5. Step 5: Solve for x
    x = 39,483,326,882.40/290,326.68
  6. Step 6: Final answer
    x = 135,996.21

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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.