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Finding the Fourth Proportional to 390,287.43, 538,589.66 and 220,517.91

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Solution

The fourth proportional to 390,287.43, 538,589.66 and 220,517.91 is: 304,310.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,287.43 : 538,589.66 = 220,517.91 : x
  2. Step 2: Convert to fraction form
    390,287.43/538,589.66 = 220,517.91/x
  3. Step 3: Cross multiply
    390,287.43x = 538,589.66 × 220,517.91
  4. Step 4: Simplify right side
    390,287.43x = 118,768,665,068.22
  5. Step 5: Solve for x
    x = 118,768,665,068.22/390,287.43
  6. Step 6: Final answer
    x = 304,310.76

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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.