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Finding the Fourth Proportional to 644,266.96, 888,945.16 and 389,612.88

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Solution

The fourth proportional to 644,266.96, 888,945.16 and 389,612.88 is: 537,579.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,266.96 : 888,945.16 = 389,612.88 : x
  2. Step 2: Convert to fraction form
    644,266.96/888,945.16 = 389,612.88/x
  3. Step 3: Cross multiply
    644,266.96x = 888,945.16 × 389,612.88
  4. Step 4: Simplify right side
    644,266.96x = 346,344,483,949.66
  5. Step 5: Solve for x
    x = 346,344,483,949.66/644,266.96
  6. Step 6: Final answer
    x = 537,579.15

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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.