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Finding the Fourth Proportional to 426,996.28, 640,895.70 and 216,785.08

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Solution

The fourth proportional to 426,996.28, 640,895.70 and 216,785.08 is: 325,381.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,996.28 : 640,895.70 = 216,785.08 : x
  2. Step 2: Convert to fraction form
    426,996.28/640,895.70 = 216,785.08/x
  3. Step 3: Cross multiply
    426,996.28x = 640,895.70 × 216,785.08
  4. Step 4: Simplify right side
    426,996.28x = 138,936,625,596.16
  5. Step 5: Solve for x
    x = 138,936,625,596.16/426,996.28
  6. Step 6: Final answer
    x = 325,381.35

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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.