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Finding the Fourth Proportional to 290,866.90, 436,299.54 and 91,188.13

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Solution

The fourth proportional to 290,866.90, 436,299.54 and 91,188.13 is: 136,781.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,866.90 : 436,299.54 = 91,188.13 : x
  2. Step 2: Convert to fraction form
    290,866.90/436,299.54 = 91,188.13/x
  3. Step 3: Cross multiply
    290,866.90x = 436,299.54 × 91,188.13
  4. Step 4: Simplify right side
    290,866.90x = 39,785,339,172.46
  5. Step 5: Solve for x
    x = 39,785,339,172.46/290,866.90
  6. Step 6: Final answer
    x = 136,781.94

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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.