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Finding the Fourth Proportional to 106,999.20, 160,345.20 and 78,698.40

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Solution

The fourth proportional to 106,999.20, 160,345.20 and 78,698.40 is: 117,934.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    106,999.20 : 160,345.20 = 78,698.40 : x
  2. Step 2: Convert to fraction form
    106,999.20/160,345.20 = 78,698.40/x
  3. Step 3: Cross multiply
    106,999.20x = 160,345.20 × 78,698.40
  4. Step 4: Simplify right side
    106,999.20x = 12,618,910,687.68
  5. Step 5: Solve for x
    x = 12,618,910,687.68/106,999.20
  6. Step 6: Final answer
    x = 117,934.63

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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.