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Finding the Fourth Proportional to 252,117.80, 378,176.70 and 85,905.80

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Solution

The fourth proportional to 252,117.80, 378,176.70 and 85,905.80 is: 128,858.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    252,117.80 : 378,176.70 = 85,905.80 : x
  2. Step 2: Convert to fraction form
    252,117.80/378,176.70 = 85,905.80/x
  3. Step 3: Cross multiply
    252,117.80x = 378,176.70 × 85,905.80
  4. Step 4: Simplify right side
    252,117.80x = 32,487,571,954.86
  5. Step 5: Solve for x
    x = 32,487,571,954.86/252,117.80
  6. Step 6: Final answer
    x = 128,858.70

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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.