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Finding the Fourth Proportional to 521,987.89, 720,309.19 and 307,086.44

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Solution

The fourth proportional to 521,987.89, 720,309.19 and 307,086.44 is: 423,759.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,987.89 : 720,309.19 = 307,086.44 : x
  2. Step 2: Convert to fraction form
    521,987.89/720,309.19 = 307,086.44/x
  3. Step 3: Cross multiply
    521,987.89x = 720,309.19 × 307,086.44
  4. Step 4: Simplify right side
    521,987.89x = 221,197,179,719.41
  5. Step 5: Solve for x
    x = 221,197,179,719.41/521,987.89
  6. Step 6: Final answer
    x = 423,759.22

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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.