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Finding the Fourth Proportional to 290,728.20, 436,221.90 and 132,875.40

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Solution

The fourth proportional to 290,728.20, 436,221.90 and 132,875.40 is: 199,372.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,728.20 : 436,221.90 = 132,875.40 : x
  2. Step 2: Convert to fraction form
    290,728.20/436,221.90 = 132,875.40/x
  3. Step 3: Cross multiply
    290,728.20x = 436,221.90 × 132,875.40
  4. Step 4: Simplify right side
    290,728.20x = 57,963,159,451.26
  5. Step 5: Solve for x
    x = 57,963,159,451.26/290,728.20
  6. Step 6: Final answer
    x = 199,372.33

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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.