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Finding the Fourth Proportional to 220,931.66, 331,438.80 and 121,036.80

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Solution

The fourth proportional to 220,931.66, 331,438.80 and 121,036.80 is: 181,577.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,931.66 : 331,438.80 = 121,036.80 : x
  2. Step 2: Convert to fraction form
    220,931.66/331,438.80 = 121,036.80/x
  3. Step 3: Cross multiply
    220,931.66x = 331,438.80 × 121,036.80
  4. Step 4: Simplify right side
    220,931.66x = 40,116,291,747.84
  5. Step 5: Solve for x
    x = 40,116,291,747.84/220,931.66
  6. Step 6: Final answer
    x = 181,577.83

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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.