Home / 138,030.81-207,308.66-85,805.25

Finding the Fourth Proportional to 138,030.81, 207,308.66 and 85,805.25

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Solution

The fourth proportional to 138,030.81, 207,308.66 and 85,805.25 is: 128,871.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,030.81 : 207,308.66 = 85,805.25 : x
  2. Step 2: Convert to fraction form
    138,030.81/207,308.66 = 85,805.25/x
  3. Step 3: Cross multiply
    138,030.81x = 207,308.66 × 85,805.25
  4. Step 4: Simplify right side
    138,030.81x = 17,788,170,969.44
  5. Step 5: Solve for x
    x = 17,788,170,969.44/138,030.81
  6. Step 6: Final answer
    x = 128,871.02

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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.