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Finding the Fourth Proportional to 390,305.30, 538,614.30 and 220,535.78

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Solution

The fourth proportional to 390,305.30, 538,614.30 and 220,535.78 is: 304,335.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,305.30 : 538,614.30 = 220,535.78 : x
  2. Step 2: Convert to fraction form
    390,305.30/538,614.30 = 220,535.78/x
  3. Step 3: Cross multiply
    390,305.30x = 538,614.30 × 220,535.78
  4. Step 4: Simplify right side
    390,305.30x = 118,783,724,769.65
  5. Step 5: Solve for x
    x = 118,783,724,769.65/390,305.30
  6. Step 6: Final answer
    x = 304,335.41

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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.