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Finding the Fourth Proportional to 426,995.28, 640,894.20 and 216,784.08

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Solution

The fourth proportional to 426,995.28, 640,894.20 and 216,784.08 is: 325,379.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,995.28 : 640,894.20 = 216,784.08 : x
  2. Step 2: Convert to fraction form
    426,995.28/640,894.20 = 216,784.08/x
  3. Step 3: Cross multiply
    426,995.28x = 640,894.20 × 216,784.08
  4. Step 4: Simplify right side
    426,995.28x = 138,935,659,524.34
  5. Step 5: Solve for x
    x = 138,935,659,524.34/426,995.28
  6. Step 6: Final answer
    x = 325,379.85

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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.