Home / 390,945.44-539,507.04-221,215.04

Finding the Fourth Proportional to 390,945.44, 539,507.04 and 221,215.04

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Solution

The fourth proportional to 390,945.44, 539,507.04 and 221,215.04 is: 305,278.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,945.44 : 539,507.04 = 221,215.04 : x
  2. Step 2: Convert to fraction form
    390,945.44/539,507.04 = 221,215.04/x
  3. Step 3: Cross multiply
    390,945.44x = 539,507.04 × 221,215.04
  4. Step 4: Simplify right side
    390,945.44x = 119,347,071,433.88
  5. Step 5: Solve for x
    x = 119,347,071,433.88/390,945.44
  6. Step 6: Final answer
    x = 305,278.08

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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.