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Finding the Fourth Proportional to 103,659.85, 155,653.80 and 78,728.05

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Solution

The fourth proportional to 103,659.85, 155,653.80 and 78,728.05 is: 118,216.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,659.85 : 155,653.80 = 78,728.05 : x
  2. Step 2: Convert to fraction form
    103,659.85/155,653.80 = 78,728.05/x
  3. Step 3: Cross multiply
    103,659.85x = 155,653.80 × 78,728.05
  4. Step 4: Simplify right side
    103,659.85x = 12,254,320,149.09
  5. Step 5: Solve for x
    x = 12,254,320,149.09/103,659.85
  6. Step 6: Final answer
    x = 118,216.65

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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.