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Finding the Fourth Proportional to 390,021.87, 585,054.69 and 109,517.25

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Solution

The fourth proportional to 390,021.87, 585,054.69 and 109,517.25 is: 164,282.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,021.87 : 585,054.69 = 109,517.25 : x
  2. Step 2: Convert to fraction form
    390,021.87/585,054.69 = 109,517.25/x
  3. Step 3: Cross multiply
    390,021.87x = 585,054.69 × 109,517.25
  4. Step 4: Simplify right side
    390,021.87x = 64,073,580,748.40
  5. Step 5: Solve for x
    x = 64,073,580,748.40/390,021.87
  6. Step 6: Final answer
    x = 164,282.02

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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.