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Finding the Fourth Proportional to 100,021.80, 137,808.55 and 65,970.21

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Solution

The fourth proportional to 100,021.80, 137,808.55 and 65,970.21 is: 90,892.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,021.80 : 137,808.55 = 65,970.21 : x
  2. Step 2: Convert to fraction form
    100,021.80/137,808.55 = 65,970.21/x
  3. Step 3: Cross multiply
    100,021.80x = 137,808.55 × 65,970.21
  4. Step 4: Simplify right side
    100,021.80x = 9,091,258,983.30
  5. Step 5: Solve for x
    x = 9,091,258,983.30/100,021.80
  6. Step 6: Final answer
    x = 90,892.78

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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.