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Finding the Fourth Proportional to 668,170.78, 922,209.66 and 396,389.56

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Solution

The fourth proportional to 668,170.78, 922,209.66 and 396,389.56 is: 547,097.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    668,170.78 : 922,209.66 = 396,389.56 : x
  2. Step 2: Convert to fraction form
    668,170.78/922,209.66 = 396,389.56/x
  3. Step 3: Cross multiply
    668,170.78x = 922,209.66 × 396,389.56
  4. Step 4: Simplify right side
    668,170.78x = 365,554,281,355.15
  5. Step 5: Solve for x
    x = 365,554,281,355.15/668,170.78
  6. Step 6: Final answer
    x = 547,097.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.