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Finding the Fourth Proportional to 397,385.80, 596,078.70 and 131,187.40

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Solution

The fourth proportional to 397,385.80, 596,078.70 and 131,187.40 is: 196,781.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    397,385.80 : 596,078.70 = 131,187.40 : x
  2. Step 2: Convert to fraction form
    397,385.80/596,078.70 = 131,187.40/x
  3. Step 3: Cross multiply
    397,385.80x = 596,078.70 × 131,187.40
  4. Step 4: Simplify right side
    397,385.80x = 78,198,014,848.38
  5. Step 5: Solve for x
    x = 78,198,014,848.38/397,385.80
  6. Step 6: Final answer
    x = 196,781.10

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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.