Home / 85,920.26-128,891.70-31,877.58

Finding the Fourth Proportional to 85,920.26, 128,891.70 and 31,877.58

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Solution

The fourth proportional to 85,920.26, 128,891.70 and 31,877.58 is: 47,820.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.26 : 128,891.70 = 31,877.58 : x
  2. Step 2: Convert to fraction form
    85,920.26/128,891.70 = 31,877.58/x
  3. Step 3: Cross multiply
    85,920.26x = 128,891.70 × 31,877.58
  4. Step 4: Simplify right side
    85,920.26x = 4,108,755,659.99
  5. Step 5: Solve for x
    x = 4,108,755,659.99/85,920.26
  6. Step 6: Final answer
    x = 47,820.57

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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.