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Finding the Fourth Proportional to 390,623.40, 539,057.70 and 220,858.20

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Solution

The fourth proportional to 390,623.40, 539,057.70 and 220,858.20 is: 304,782.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,623.40 : 539,057.70 = 220,858.20 : x
  2. Step 2: Convert to fraction form
    390,623.40/539,057.70 = 220,858.20/x
  3. Step 3: Cross multiply
    390,623.40x = 539,057.70 × 220,858.20
  4. Step 4: Simplify right side
    390,623.40x = 119,055,313,318.14
  5. Step 5: Solve for x
    x = 119,055,313,318.14/390,623.40
  6. Step 6: Final answer
    x = 304,782.85

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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.