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Finding the Fourth Proportional to 155,855.83, 215,076.74 and 87,872.21

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Solution

The fourth proportional to 155,855.83, 215,076.74 and 87,872.21 is: 121,261.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,855.83 : 215,076.74 = 87,872.21 : x
  2. Step 2: Convert to fraction form
    155,855.83/215,076.74 = 87,872.21/x
  3. Step 3: Cross multiply
    155,855.83x = 215,076.74 × 87,872.21
  4. Step 4: Simplify right side
    155,855.83x = 18,899,268,145.38
  5. Step 5: Solve for x
    x = 18,899,268,145.38/155,855.83
  6. Step 6: Final answer
    x = 121,261.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.