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Finding the Fourth Proportional to 290,806.40, 436,209.71 and 91,142.28

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Solution

The fourth proportional to 290,806.40, 436,209.71 and 91,142.28 is: 136,713.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,806.40 : 436,209.71 = 91,142.28 : x
  2. Step 2: Convert to fraction form
    290,806.40/436,209.71 = 91,142.28/x
  3. Step 3: Cross multiply
    290,806.40x = 436,209.71 × 91,142.28
  4. Step 4: Simplify right side
    290,806.40x = 39,757,147,071.83
  5. Step 5: Solve for x
    x = 39,757,147,071.83/290,806.40
  6. Step 6: Final answer
    x = 136,713.45

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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.