Home / 138,680.07-208,163.67-85,410.42

Finding the Fourth Proportional to 138,680.07, 208,163.67 and 85,410.42

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Solution

The fourth proportional to 138,680.07, 208,163.67 and 85,410.42 is: 128,204.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,680.07 : 208,163.67 = 85,410.42 : x
  2. Step 2: Convert to fraction form
    138,680.07/208,163.67 = 85,410.42/x
  3. Step 3: Cross multiply
    138,680.07x = 208,163.67 × 85,410.42
  4. Step 4: Simplify right side
    138,680.07x = 17,779,346,483.44
  5. Step 5: Solve for x
    x = 17,779,346,483.44/138,680.07
  6. Step 6: Final answer
    x = 128,204.05

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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.