Home / 390,972.32-539,553.12-221,202.80

Finding the Fourth Proportional to 390,972.32, 539,553.12 and 221,202.80

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Solution

The fourth proportional to 390,972.32, 539,553.12 and 221,202.80 is: 305,266.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,972.32 : 539,553.12 = 221,202.80 : x
  2. Step 2: Convert to fraction form
    390,972.32/539,553.12 = 221,202.80/x
  3. Step 3: Cross multiply
    390,972.32x = 539,553.12 × 221,202.80
  4. Step 4: Simplify right side
    390,972.32x = 119,350,660,892.74
  5. Step 5: Solve for x
    x = 119,350,660,892.74/390,972.32
  6. Step 6: Final answer
    x = 305,266.27

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1.5x scale

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.