Home / 138,784.55-191,511.99-78,361.16

Finding the Fourth Proportional to 138,784.55, 191,511.99 and 78,361.16

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Solution

The fourth proportional to 138,784.55, 191,511.99 and 78,361.16 is: 108,132.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,784.55 : 191,511.99 = 78,361.16 : x
  2. Step 2: Convert to fraction form
    138,784.55/191,511.99 = 78,361.16/x
  3. Step 3: Cross multiply
    138,784.55x = 191,511.99 × 78,361.16
  4. Step 4: Simplify right side
    138,784.55x = 15,007,101,690.31
  5. Step 5: Solve for x
    x = 15,007,101,690.31/138,784.55
  6. Step 6: Final answer
    x = 108,132.37

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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.