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Finding the Fourth Proportional to 78,720.36, 108,635.36 and 42,910.40

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Solution

The fourth proportional to 78,720.36, 108,635.36 and 42,910.40 is: 59,217.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720.36 : 108,635.36 = 42,910.40 : x
  2. Step 2: Convert to fraction form
    78,720.36/108,635.36 = 42,910.40/x
  3. Step 3: Cross multiply
    78,720.36x = 108,635.36 × 42,910.40
  4. Step 4: Simplify right side
    78,720.36x = 4,661,585,994.02
  5. Step 5: Solve for x
    x = 4,661,585,994.02/78,720.36
  6. Step 6: Final answer
    x = 59,217.03

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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.