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Finding the Fourth Proportional to 138,801.40, 208,056.30 and 79,509.40

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Solution

The fourth proportional to 138,801.40, 208,056.30 and 79,509.40 is: 119,180.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,801.40 : 208,056.30 = 79,509.40 : x
  2. Step 2: Convert to fraction form
    138,801.40/208,056.30 = 79,509.40/x
  3. Step 3: Cross multiply
    138,801.40x = 208,056.30 × 79,509.40
  4. Step 4: Simplify right side
    138,801.40x = 16,542,431,579.22
  5. Step 5: Solve for x
    x = 16,542,431,579.22/138,801.40
  6. Step 6: Final answer
    x = 119,180.58

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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.