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Finding the Fourth Proportional to 390,060.05, 538,272.46 and 217,979.36

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Solution

The fourth proportional to 390,060.05, 538,272.46 and 217,979.36 is: 300,805.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,060.05 : 538,272.46 = 217,979.36 : x
  2. Step 2: Convert to fraction form
    390,060.05/538,272.46 = 217,979.36/x
  3. Step 3: Cross multiply
    390,060.05x = 538,272.46 × 217,979.36
  4. Step 4: Simplify right side
    390,060.05x = 117,332,283,100.12
  5. Step 5: Solve for x
    x = 117,332,283,100.12/390,060.05
  6. Step 6: Final answer
    x = 300,805.69

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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.