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Finding the Fourth Proportional to 398,866.72, 550,437.84 and 217,582.72

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Solution

The fourth proportional to 398,866.72, 550,437.84 and 217,582.72 is: 300,265.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,866.72 : 550,437.84 = 217,582.72 : x
  2. Step 2: Convert to fraction form
    398,866.72/550,437.84 = 217,582.72/x
  3. Step 3: Cross multiply
    398,866.72x = 550,437.84 × 217,582.72
  4. Step 4: Simplify right side
    398,866.72x = 119,765,762,418.13
  5. Step 5: Solve for x
    x = 119,765,762,418.13/398,866.72
  6. Step 6: Final answer
    x = 300,265.12

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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.