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Finding the Fourth Proportional to 654.86, 903.83 and 389.18

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Solution

The fourth proportional to 654.86, 903.83 and 389.18 is: 537.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.86 : 903.83 = 389.18 : x
  2. Step 2: Convert to fraction form
    654.86/903.83 = 389.18/x
  3. Step 3: Cross multiply
    654.86x = 903.83 × 389.18
  4. Step 4: Simplify right side
    654.86x = 351,752.87
  5. Step 5: Solve for x
    x = 351,752.87/654.86
  6. Step 6: Final answer
    x = 537.14

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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.