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Finding the Fourth Proportional to 390,290.43, 538,593.78 and 220,520.91

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Solution

The fourth proportional to 390,290.43, 538,593.78 and 220,520.91 is: 304,314.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,290.43 : 538,593.78 = 220,520.91 : x
  2. Step 2: Convert to fraction form
    390,290.43/538,593.78 = 220,520.91/x
  3. Step 3: Cross multiply
    390,290.43x = 538,593.78 × 220,520.91
  4. Step 4: Simplify right side
    390,290.43x = 118,771,190,485.94
  5. Step 5: Solve for x
    x = 118,771,190,485.94/390,290.43
  6. Step 6: Final answer
    x = 304,314.89

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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.