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Finding the Fourth Proportional to 426,988.56, 640,459.74 and 216,621.03

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Solution

The fourth proportional to 426,988.56, 640,459.74 and 216,621.03 is: 324,919.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,988.56 : 640,459.74 = 216,621.03 : x
  2. Step 2: Convert to fraction form
    426,988.56/640,459.74 = 216,621.03/x
  3. Step 3: Cross multiply
    426,988.56x = 640,459.74 × 216,621.03
  4. Step 4: Simplify right side
    426,988.56x = 138,737,048,552.33
  5. Step 5: Solve for x
    x = 138,737,048,552.33/426,988.56
  6. Step 6: Final answer
    x = 324,919.83

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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.