Home / 81,021.40-121,515.90-38,901.40

Finding the Fourth Proportional to 81,021.40, 121,515.90 and 38,901.40

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Solution

The fourth proportional to 81,021.40, 121,515.90 and 38,901.40 is: 58,344.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,021.40 : 121,515.90 = 38,901.40 : x
  2. Step 2: Convert to fraction form
    81,021.40/121,515.90 = 38,901.40/x
  3. Step 3: Cross multiply
    81,021.40x = 121,515.90 × 38,901.40
  4. Step 4: Simplify right side
    81,021.40x = 4,727,138,632.26
  5. Step 5: Solve for x
    x = 4,727,138,632.26/81,021.40
  6. Step 6: Final answer
    x = 58,344.32

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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.