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Finding the Fourth Proportional to 79,995.47, 120,000.10 and 20,831.25

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Solution

The fourth proportional to 79,995.47, 120,000.10 and 20,831.25 is: 31,248.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,995.47 : 120,000.10 = 20,831.25 : x
  2. Step 2: Convert to fraction form
    79,995.47/120,000.10 = 20,831.25/x
  3. Step 3: Cross multiply
    79,995.47x = 120,000.10 × 20,831.25
  4. Step 4: Simplify right side
    79,995.47x = 2,499,752,031.05
  5. Step 5: Solve for x
    x = 2,499,752,031.05/79,995.47
  6. Step 6: Final answer
    x = 31,248.67

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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.