Home / 77,090.15-115,642.92-20,931.17

Finding the Fourth Proportional to 77,090.15, 115,642.92 and 20,931.17

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Solution

The fourth proportional to 77,090.15, 115,642.92 and 20,931.17 is: 31,398.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,090.15 : 115,642.92 = 20,931.17 : x
  2. Step 2: Convert to fraction form
    77,090.15/115,642.92 = 20,931.17/x
  3. Step 3: Cross multiply
    77,090.15x = 115,642.92 × 20,931.17
  4. Step 4: Simplify right side
    77,090.15x = 2,420,541,039.60
  5. Step 5: Solve for x
    x = 2,420,541,039.60/77,090.15
  6. Step 6: Final answer
    x = 31,398.84

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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.