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Finding the Fourth Proportional to 290,326.41, 435,489.45 and 90,663.90

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Solution

The fourth proportional to 290,326.41, 435,489.45 and 90,663.90 is: 135,995.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,326.41 : 435,489.45 = 90,663.90 : x
  2. Step 2: Convert to fraction form
    290,326.41/435,489.45 = 90,663.90/x
  3. Step 3: Cross multiply
    290,326.41x = 435,489.45 × 90,663.90
  4. Step 4: Simplify right side
    290,326.41x = 39,483,171,945.86
  5. Step 5: Solve for x
    x = 39,483,171,945.86/290,326.41
  6. Step 6: Final answer
    x = 135,995.80

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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.