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Finding the Fourth Proportional to 611,221.15, 916,624.11 and 211,768.70

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Solution

The fourth proportional to 611,221.15, 916,624.11 and 211,768.70 is: 317,581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,221.15 : 916,624.11 = 211,768.70 : x
  2. Step 2: Convert to fraction form
    611,221.15/916,624.11 = 211,768.70/x
  3. Step 3: Cross multiply
    611,221.15x = 916,624.11 × 211,768.70
  4. Step 4: Simplify right side
    611,221.15x = 194,112,292,374.37
  5. Step 5: Solve for x
    x = 194,112,292,374.37/611,221.15
  6. Step 6: Final answer
    x = 317,581.11

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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.