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Finding the Fourth Proportional to 287,791.60, 431,687.40 and 90,799.60

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Solution

The fourth proportional to 287,791.60, 431,687.40 and 90,799.60 is: 136,199.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,791.60 : 431,687.40 = 90,799.60 : x
  2. Step 2: Convert to fraction form
    287,791.60/431,687.40 = 90,799.60/x
  3. Step 3: Cross multiply
    287,791.60x = 431,687.40 × 90,799.60
  4. Step 4: Simplify right side
    287,791.60x = 39,197,043,245.04
  5. Step 5: Solve for x
    x = 39,197,043,245.04/287,791.60
  6. Step 6: Final answer
    x = 136,199.40

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1.5x scale

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.