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Finding the Fourth Proportional to 39,987.40, 60,018.00 and 20,279.79

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Solution

The fourth proportional to 39,987.40, 60,018.00 and 20,279.79 is: 30,438.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,987.40 : 60,018.00 = 20,279.79 : x
  2. Step 2: Convert to fraction form
    39,987.40/60,018.00 = 20,279.79/x
  3. Step 3: Cross multiply
    39,987.40x = 60,018.00 × 20,279.79
  4. Step 4: Simplify right side
    39,987.40x = 1,217,152,614.53
  5. Step 5: Solve for x
    x = 1,217,152,614.53/39,987.40
  6. Step 6: Final answer
    x = 30,438.41

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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.