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Finding the Fourth Proportional to 78,820.81, 118,227.90 and 36,686.40

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Solution

The fourth proportional to 78,820.81, 118,227.90 and 36,686.40 is: 55,028.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,820.81 : 118,227.90 = 36,686.40 : x
  2. Step 2: Convert to fraction form
    78,820.81/118,227.90 = 36,686.40/x
  3. Step 3: Cross multiply
    78,820.81x = 118,227.90 × 36,686.40
  4. Step 4: Simplify right side
    78,820.81x = 4,337,355,255.99
  5. Step 5: Solve for x
    x = 4,337,355,255.99/78,820.81
  6. Step 6: Final answer
    x = 55,028.05

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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.