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Finding the Fourth Proportional to 398,985.94, 550,602.32 and 217,701.66

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Solution

The fourth proportional to 398,985.94, 550,602.32 and 217,701.66 is: 300,429.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,985.94 : 550,602.32 = 217,701.66 : x
  2. Step 2: Convert to fraction form
    398,985.94/550,602.32 = 217,701.66/x
  3. Step 3: Cross multiply
    398,985.94x = 550,602.32 × 217,701.66
  4. Step 4: Simplify right side
    398,985.94x = 119,867,039,063.85
  5. Step 5: Solve for x
    x = 119,867,039,063.85/398,985.94
  6. Step 6: Final answer
    x = 300,429.23

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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.