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Finding the Fourth Proportional to 554,638.80, 765,401.60 and 299,990

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Solution

The fourth proportional to 554,638.80, 765,401.60 and 299,990 is: 413,986.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    554,638.80 : 765,401.60 = 299,990 : x
  2. Step 2: Convert to fraction form
    554,638.80/765,401.60 = 299,990/x
  3. Step 3: Cross multiply
    554,638.80x = 765,401.60 × 299,990
  4. Step 4: Simplify right side
    554,638.80x = 229,612,825,984
  5. Step 5: Solve for x
    x = 229,612,825,984/554,638.80
  6. Step 6: Final answer
    x = 413,986.23

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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.