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Finding the Fourth Proportional to 84,011.80, 126,017.70 and 83,428.60

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Solution

The fourth proportional to 84,011.80, 126,017.70 and 83,428.60 is: 125,142.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,011.80 : 126,017.70 = 83,428.60 : x
  2. Step 2: Convert to fraction form
    84,011.80/126,017.70 = 83,428.60/x
  3. Step 3: Cross multiply
    84,011.80x = 126,017.70 × 83,428.60
  4. Step 4: Simplify right side
    84,011.80x = 10,513,480,286.22
  5. Step 5: Solve for x
    x = 10,513,480,286.22/84,011.80
  6. Step 6: Final answer
    x = 125,142.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.