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Finding the Fourth Proportional to 290,987.78, 436,480.85 and 91,309.01

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Solution

The fourth proportional to 290,987.78, 436,480.85 and 91,309.01 is: 136,963.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,987.78 : 436,480.85 = 91,309.01 : x
  2. Step 2: Convert to fraction form
    290,987.78/436,480.85 = 91,309.01/x
  3. Step 3: Cross multiply
    290,987.78x = 436,480.85 × 91,309.01
  4. Step 4: Simplify right side
    290,987.78x = 39,854,632,343.33
  5. Step 5: Solve for x
    x = 39,854,632,343.33/290,987.78
  6. Step 6: Final answer
    x = 136,963.25

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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.