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Finding the Fourth Proportional to 398,955.87, 550,557.74 and 217,667.84

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Solution

The fourth proportional to 398,955.87, 550,557.74 and 217,667.84 is: 300,380.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,955.87 : 550,557.74 = 217,667.84 : x
  2. Step 2: Convert to fraction form
    398,955.87/550,557.74 = 217,667.84/x
  3. Step 3: Cross multiply
    398,955.87x = 550,557.74 × 217,667.84
  4. Step 4: Simplify right side
    398,955.87x = 119,838,711,852.46
  5. Step 5: Solve for x
    x = 119,838,711,852.46/398,955.87
  6. Step 6: Final answer
    x = 300,380.87

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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.