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Finding the Fourth Proportional to 78,205.80, 109,356.90 and 78,205.80

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Solution

The fourth proportional to 78,205.80, 109,356.90 and 78,205.80 is: 109,356.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,205.80 : 109,356.90 = 78,205.80 : x
  2. Step 2: Convert to fraction form
    78,205.80/109,356.90 = 78,205.80/x
  3. Step 3: Cross multiply
    78,205.80x = 109,356.90 × 78,205.80
  4. Step 4: Simplify right side
    78,205.80x = 8,552,343,850.02
  5. Step 5: Solve for x
    x = 8,552,343,850.02/78,205.80
  6. Step 6: Final answer
    x = 109,356.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.