Home / 75,135.12-103,686.64-40,680.20

Finding the Fourth Proportional to 75,135.12, 103,686.64 and 40,680.20

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Solution

The fourth proportional to 75,135.12, 103,686.64 and 40,680.20 is: 56,138.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,135.12 : 103,686.64 = 40,680.20 : x
  2. Step 2: Convert to fraction form
    75,135.12/103,686.64 = 40,680.20/x
  3. Step 3: Cross multiply
    75,135.12x = 103,686.64 × 40,680.20
  4. Step 4: Simplify right side
    75,135.12x = 4,217,993,252.53
  5. Step 5: Solve for x
    x = 4,217,993,252.53/75,135.12
  6. Step 6: Final answer
    x = 56,138.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.