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Finding the Fourth Proportional to 287,380.04, 431,137.08 and 87,700.05

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Solution

The fourth proportional to 287,380.04, 431,137.08 and 87,700.05 is: 131,570.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,380.04 : 431,137.08 = 87,700.05 : x
  2. Step 2: Convert to fraction form
    287,380.04/431,137.08 = 87,700.05/x
  3. Step 3: Cross multiply
    287,380.04x = 431,137.08 × 87,700.05
  4. Step 4: Simplify right side
    287,380.04x = 37,810,743,472.85
  5. Step 5: Solve for x
    x = 37,810,743,472.85/287,380.04
  6. Step 6: Final answer
    x = 131,570.53

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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.