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Finding the Fourth Proportional to 390,725.34, 539,046.81 and 245,445.78

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Solution

The fourth proportional to 390,725.34, 539,046.81 and 245,445.78 is: 338,618.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,725.34 : 539,046.81 = 245,445.78 : x
  2. Step 2: Convert to fraction form
    390,725.34/539,046.81 = 245,445.78/x
  3. Step 3: Cross multiply
    390,725.34x = 539,046.81 × 245,445.78
  4. Step 4: Simplify right side
    390,725.34x = 132,306,764,736.96
  5. Step 5: Solve for x
    x = 132,306,764,736.96/390,725.34
  6. Step 6: Final answer
    x = 338,618.34

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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.