Home / 138,913.21-191,708.49-78,493.24

Finding the Fourth Proportional to 138,913.21, 191,708.49 and 78,493.24

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Solution

The fourth proportional to 138,913.21, 191,708.49 and 78,493.24 is: 108,325.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913.21 : 191,708.49 = 78,493.24 : x
  2. Step 2: Convert to fraction form
    138,913.21/191,708.49 = 78,493.24/x
  3. Step 3: Cross multiply
    138,913.21x = 191,708.49 × 78,493.24
  4. Step 4: Simplify right side
    138,913.21x = 15,047,820,515.61
  5. Step 5: Solve for x
    x = 15,047,820,515.61/138,913.21
  6. Step 6: Final answer
    x = 108,325.34

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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.