Home / 81,014-121,575-31,135.28

Finding the Fourth Proportional to 81,014, 121,575 and 31,135.28

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Solution

The fourth proportional to 81,014, 121,575 and 31,135.28 is: 46,723.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,014 : 121,575 = 31,135.28 : x
  2. Step 2: Convert to fraction form
    81,014/121,575 = 31,135.28/x
  3. Step 3: Cross multiply
    81,014x = 121,575 × 31,135.28
  4. Step 4: Simplify right side
    81,014x = 3,785,271,666
  5. Step 5: Solve for x
    x = 3,785,271,666/81,014
  6. Step 6: Final answer
    x = 46,723.67

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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.