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Finding the Fourth Proportional to 390,331.87, 538,806.62 and 254,398.88

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Solution

The fourth proportional to 390,331.87, 538,806.62 and 254,398.88 is: 351,167.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,331.87 : 538,806.62 = 254,398.88 : x
  2. Step 2: Convert to fraction form
    390,331.87/538,806.62 = 254,398.88/x
  3. Step 3: Cross multiply
    390,331.87x = 538,806.62 × 254,398.88
  4. Step 4: Simplify right side
    390,331.87x = 137,071,800,664.59
  5. Step 5: Solve for x
    x = 137,071,800,664.59/390,331.87
  6. Step 6: Final answer
    x = 351,167.33

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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.