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Finding the Fourth Proportional to 403,939.60, 605,909.40 and 217,315.60

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Solution

The fourth proportional to 403,939.60, 605,909.40 and 217,315.60 is: 325,973.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,939.60 : 605,909.40 = 217,315.60 : x
  2. Step 2: Convert to fraction form
    403,939.60/605,909.40 = 217,315.60/x
  3. Step 3: Cross multiply
    403,939.60x = 605,909.40 × 217,315.60
  4. Step 4: Simplify right side
    403,939.60x = 131,673,564,806.64
  5. Step 5: Solve for x
    x = 131,673,564,806.64/403,939.60
  6. Step 6: Final answer
    x = 325,973.40

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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.