Home / 390,288.90-585,964.46-219,631.18

Finding the Fourth Proportional to 390,288.90, 585,964.46 and 219,631.18

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Solution

The fourth proportional to 390,288.90, 585,964.46 and 219,631.18 is: 329,745.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,288.90 : 585,964.46 = 219,631.18 : x
  2. Step 2: Convert to fraction form
    390,288.90/585,964.46 = 219,631.18/x
  3. Step 3: Cross multiply
    390,288.90x = 585,964.46 × 219,631.18
  4. Step 4: Simplify right side
    390,288.90x = 128,696,065,787.86
  5. Step 5: Solve for x
    x = 128,696,065,787.86/390,288.90
  6. Step 6: Final answer
    x = 329,745.65

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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.