Home / 78,720.36-108,633.66-42,910.05

Finding the Fourth Proportional to 78,720.36, 108,633.66 and 42,910.05

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Solution

The fourth proportional to 78,720.36, 108,633.66 and 42,910.05 is: 59,215.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.36 : 108,633.66 = 42,910.05 : x
  2. Step 2: Convert to fraction form
    78,720.36/108,633.66 = 42,910.05/x
  3. Step 3: Cross multiply
    78,720.36x = 108,633.66 × 42,910.05
  4. Step 4: Simplify right side
    78,720.36x = 4,661,476,028.75
  5. Step 5: Solve for x
    x = 4,661,476,028.75/78,720.36
  6. Step 6: Final answer
    x = 59,215.64

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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.