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Finding the Fourth Proportional to 390,015.30, 585,217.35 and 221,664.90

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Solution

The fourth proportional to 390,015.30, 585,217.35 and 221,664.90 is: 332,607.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,015.30 : 585,217.35 = 221,664.90 : x
  2. Step 2: Convert to fraction form
    390,015.30/585,217.35 = 221,664.90/x
  3. Step 3: Cross multiply
    390,015.30x = 585,217.35 × 221,664.90
  4. Step 4: Simplify right side
    390,015.30x = 129,722,145,366.02
  5. Step 5: Solve for x
    x = 129,722,145,366.02/390,015.30
  6. Step 6: Final answer
    x = 332,607.84

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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.