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Finding the Fourth Proportional to 390,545.28, 538,940.16 and 220,769.28

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Solution

The fourth proportional to 390,545.28, 538,940.16 and 220,769.28 is: 304,654.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,545.28 : 538,940.16 = 220,769.28 : x
  2. Step 2: Convert to fraction form
    390,545.28/538,940.16 = 220,769.28/x
  3. Step 3: Cross multiply
    390,545.28x = 538,940.16 × 220,769.28
  4. Step 4: Simplify right side
    390,545.28x = 118,981,431,086.29
  5. Step 5: Solve for x
    x = 118,981,431,086.29/390,545.28
  6. Step 6: Final answer
    x = 304,654.64

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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.