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Finding the Fourth Proportional to 218,018.40, 300,890.33 and 121,231.90

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Solution

The fourth proportional to 218,018.40, 300,890.33 and 121,231.90 is: 167,313.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,018.40 : 300,890.33 = 121,231.90 : x
  2. Step 2: Convert to fraction form
    218,018.40/300,890.33 = 121,231.90/x
  3. Step 3: Cross multiply
    218,018.40x = 300,890.33 × 121,231.90
  4. Step 4: Simplify right side
    218,018.40x = 36,477,506,397.53
  5. Step 5: Solve for x
    x = 36,477,506,397.53/218,018.40
  6. Step 6: Final answer
    x = 167,313.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.