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Finding the Fourth Proportional to 39,811.40, 59,720.70 and 20,077.40

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Solution

The fourth proportional to 39,811.40, 59,720.70 and 20,077.40 is: 30,117.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,811.40 : 59,720.70 = 20,077.40 : x
  2. Step 2: Convert to fraction form
    39,811.40/59,720.70 = 20,077.40/x
  3. Step 3: Cross multiply
    39,811.40x = 59,720.70 × 20,077.40
  4. Step 4: Simplify right side
    39,811.40x = 1,199,036,382.18
  5. Step 5: Solve for x
    x = 1,199,036,382.18/39,811.40
  6. Step 6: Final answer
    x = 30,117.92

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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.