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Finding the Fourth Proportional to 654.89, 903.77 and 389.47

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Solution

The fourth proportional to 654.89, 903.77 and 389.47 is: 537.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.89 : 903.77 = 389.47 : x
  2. Step 2: Convert to fraction form
    654.89/903.77 = 389.47/x
  3. Step 3: Cross multiply
    654.89x = 903.77 × 389.47
  4. Step 4: Simplify right side
    654.89x = 351,988.56
  5. Step 5: Solve for x
    x = 351,988.56/654.89
  6. Step 6: Final answer
    x = 537.48

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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.