Home / 78,720.19-108,633.56-42,910.09

Finding the Fourth Proportional to 78,720.19, 108,633.56 and 42,910.09

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Solution

The fourth proportional to 78,720.19, 108,633.56 and 42,910.09 is: 59,215.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.19 : 108,633.56 = 42,910.09 : x
  2. Step 2: Convert to fraction form
    78,720.19/108,633.56 = 42,910.09/x
  3. Step 3: Cross multiply
    78,720.19x = 108,633.56 × 42,910.09
  4. Step 4: Simplify right side
    78,720.19x = 4,661,475,350.49
  5. Step 5: Solve for x
    x = 4,661,475,350.49/78,720.19
  6. Step 6: Final answer
    x = 59,215.76

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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.