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Finding the Fourth Proportional to 390,539.40, 585,371.70 and 222,140.40

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Solution

The fourth proportional to 390,539.40, 585,371.70 and 222,140.40 is: 332,961.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,539.40 : 585,371.70 = 222,140.40 : x
  2. Step 2: Convert to fraction form
    390,539.40/585,371.70 = 222,140.40/x
  3. Step 3: Cross multiply
    390,539.40x = 585,371.70 × 222,140.40
  4. Step 4: Simplify right side
    390,539.40x = 130,034,703,586.68
  5. Step 5: Solve for x
    x = 130,034,703,586.68/390,539.40
  6. Step 6: Final answer
    x = 332,961.81

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1.5x scale

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.