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Finding the Fourth Proportional to 399,003, 550,624.14 and 220,155

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Solution

The fourth proportional to 399,003, 550,624.14 and 220,155 is: 303,813.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,003 : 550,624.14 = 220,155 : x
  2. Step 2: Convert to fraction form
    399,003/550,624.14 = 220,155/x
  3. Step 3: Cross multiply
    399,003x = 550,624.14 × 220,155
  4. Step 4: Simplify right side
    399,003x = 121,222,657,541.70
  5. Step 5: Solve for x
    x = 121,222,657,541.70/399,003
  6. Step 6: Final answer
    x = 303,813.90

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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.