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Finding the Fourth Proportional to 290,720.80, 436,081.20 and 157,664.80

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Solution

The fourth proportional to 290,720.80, 436,081.20 and 157,664.80 is: 236,497.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,720.80 : 436,081.20 = 157,664.80 : x
  2. Step 2: Convert to fraction form
    290,720.80/436,081.20 = 157,664.80/x
  3. Step 3: Cross multiply
    290,720.80x = 436,081.20 × 157,664.80
  4. Step 4: Simplify right side
    290,720.80x = 68,754,655,181.76
  5. Step 5: Solve for x
    x = 68,754,655,181.76/290,720.80
  6. Step 6: Final answer
    x = 236,497.20

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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.