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Finding the Fourth Proportional to 418,981.78, 628,473.96 and 103,438.72

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Solution

The fourth proportional to 418,981.78, 628,473.96 and 103,438.72 is: 155,158.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,981.78 : 628,473.96 = 103,438.72 : x
  2. Step 2: Convert to fraction form
    418,981.78/628,473.96 = 103,438.72/x
  3. Step 3: Cross multiply
    418,981.78x = 628,473.96 × 103,438.72
  4. Step 4: Simplify right side
    418,981.78x = 65,008,541,975.73
  5. Step 5: Solve for x
    x = 65,008,541,975.73/418,981.78
  6. Step 6: Final answer
    x = 155,158.40

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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.