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Finding the Fourth Proportional to 172,978.80, 259,476.30 and 54,659.40

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Solution

The fourth proportional to 172,978.80, 259,476.30 and 54,659.40 is: 81,991.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,978.80 : 259,476.30 = 54,659.40 : x
  2. Step 2: Convert to fraction form
    172,978.80/259,476.30 = 54,659.40/x
  3. Step 3: Cross multiply
    172,978.80x = 259,476.30 × 54,659.40
  4. Step 4: Simplify right side
    172,978.80x = 14,182,818,872.22
  5. Step 5: Solve for x
    x = 14,182,818,872.22/172,978.80
  6. Step 6: Final answer
    x = 81,991.66

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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.