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Finding the Fourth Proportional to 78,785.60, 118,189.20 and 26,189.60

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Solution

The fourth proportional to 78,785.60, 118,189.20 and 26,189.60 is: 39,287.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,785.60 : 118,189.20 = 26,189.60 : x
  2. Step 2: Convert to fraction form
    78,785.60/118,189.20 = 26,189.60/x
  3. Step 3: Cross multiply
    78,785.60x = 118,189.20 × 26,189.60
  4. Step 4: Simplify right side
    78,785.60x = 3,095,327,872.32
  5. Step 5: Solve for x
    x = 3,095,327,872.32/78,785.60
  6. Step 6: Final answer
    x = 39,287.99

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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.