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Finding the Fourth Proportional to 131,445.20, 197,167.80 and 81,678.80

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Solution

The fourth proportional to 131,445.20, 197,167.80 and 81,678.80 is: 122,518.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,445.20 : 197,167.80 = 81,678.80 : x
  2. Step 2: Convert to fraction form
    131,445.20/197,167.80 = 81,678.80/x
  3. Step 3: Cross multiply
    131,445.20x = 197,167.80 × 81,678.80
  4. Step 4: Simplify right side
    131,445.20x = 16,104,429,302.64
  5. Step 5: Solve for x
    x = 16,104,429,302.64/131,445.20
  6. Step 6: Final answer
    x = 122,518.20

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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.