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Finding the Fourth Proportional to 290,881.64, 436,323.06 and 80,520.20

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Solution

The fourth proportional to 290,881.64, 436,323.06 and 80,520.20 is: 120,780.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,881.64 : 436,323.06 = 80,520.20 : x
  2. Step 2: Convert to fraction form
    290,881.64/436,323.06 = 80,520.20/x
  3. Step 3: Cross multiply
    290,881.64x = 436,323.06 × 80,520.20
  4. Step 4: Simplify right side
    290,881.64x = 35,132,820,055.81
  5. Step 5: Solve for x
    x = 35,132,820,055.81/290,881.64
  6. Step 6: Final answer
    x = 120,780.47

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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.