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Finding the Fourth Proportional to 287,790.08, 431,685.60 and 77,422.40

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Solution

The fourth proportional to 287,790.08, 431,685.60 and 77,422.40 is: 116,133.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,790.08 : 431,685.60 = 77,422.40 : x
  2. Step 2: Convert to fraction form
    287,790.08/431,685.60 = 77,422.40/x
  3. Step 3: Cross multiply
    287,790.08x = 431,685.60 × 77,422.40
  4. Step 4: Simplify right side
    287,790.08x = 33,422,135,197.44
  5. Step 5: Solve for x
    x = 33,422,135,197.44/287,790.08
  6. Step 6: Final answer
    x = 116,133.73

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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.