Home / 81,109.03-111,117.51-78,076.70

Finding the Fourth Proportional to 81,109.03, 111,117.51 and 78,076.70

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Solution

The fourth proportional to 81,109.03, 111,117.51 and 78,076.70 is: 106,963.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,109.03 : 111,117.51 = 78,076.70 : x
  2. Step 2: Convert to fraction form
    81,109.03/111,117.51 = 78,076.70/x
  3. Step 3: Cross multiply
    81,109.03x = 111,117.51 × 78,076.70
  4. Step 4: Simplify right side
    81,109.03x = 8,675,688,493.02
  5. Step 5: Solve for x
    x = 8,675,688,493.02/81,109.03
  6. Step 6: Final answer
    x = 106,963.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.