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Finding the Fourth Proportional to 554,639.40, 765,401.40 and 299,991.60

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Solution

The fourth proportional to 554,639.40, 765,401.40 and 299,991.60 is: 413,987.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    554,639.40 : 765,401.40 = 299,991.60 : x
  2. Step 2: Convert to fraction form
    554,639.40/765,401.40 = 299,991.60/x
  3. Step 3: Cross multiply
    554,639.40x = 765,401.40 × 299,991.60
  4. Step 4: Simplify right side
    554,639.40x = 229,613,990,628.24
  5. Step 5: Solve for x
    x = 229,613,990,628.24/554,639.40
  6. Step 6: Final answer
    x = 413,987.88

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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.