Home / 138,602.14-191,268.75-78,172.90

Finding the Fourth Proportional to 138,602.14, 191,268.75 and 78,172.90

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Solution

The fourth proportional to 138,602.14, 191,268.75 and 78,172.90 is: 107,877.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,602.14 : 191,268.75 = 78,172.90 : x
  2. Step 2: Convert to fraction form
    138,602.14/191,268.75 = 78,172.90/x
  3. Step 3: Cross multiply
    138,602.14x = 191,268.75 × 78,172.90
  4. Step 4: Simplify right side
    138,602.14x = 14,952,032,866.88
  5. Step 5: Solve for x
    x = 14,952,032,866.88/138,602.14
  6. Step 6: Final answer
    x = 107,877.36

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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.