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Finding the Fourth Proportional to 84,155.40, 125,740.13 and 81,212.13

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Solution

The fourth proportional to 84,155.40, 125,740.13 and 81,212.13 is: 121,342.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,155.40 : 125,740.13 = 81,212.13 : x
  2. Step 2: Convert to fraction form
    84,155.40/125,740.13 = 81,212.13/x
  3. Step 3: Cross multiply
    84,155.40x = 125,740.13 × 81,212.13
  4. Step 4: Simplify right side
    84,155.40x = 10,211,623,377.72
  5. Step 5: Solve for x
    x = 10,211,623,377.72/84,155.40
  6. Step 6: Final answer
    x = 121,342.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.