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Finding the Fourth Proportional to 268,290.60, 402,435.90 and 81,277.80

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Solution

The fourth proportional to 268,290.60, 402,435.90 and 81,277.80 is: 121,916.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,290.60 : 402,435.90 = 81,277.80 : x
  2. Step 2: Convert to fraction form
    268,290.60/402,435.90 = 81,277.80/x
  3. Step 3: Cross multiply
    268,290.60x = 402,435.90 × 81,277.80
  4. Step 4: Simplify right side
    268,290.60x = 32,709,104,593.02
  5. Step 5: Solve for x
    x = 32,709,104,593.02/268,290.60
  6. Step 6: Final answer
    x = 121,916.70

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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.