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Finding the Fourth Proportional to 654.93, 903.69 and 392.88

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Solution

The fourth proportional to 654.93, 903.69 and 392.88 is: 542.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.93 : 903.69 = 392.88 : x
  2. Step 2: Convert to fraction form
    654.93/903.69 = 392.88/x
  3. Step 3: Cross multiply
    654.93x = 903.69 × 392.88
  4. Step 4: Simplify right side
    654.93x = 355,041.73
  5. Step 5: Solve for x
    x = 355,041.73/654.93
  6. Step 6: Final answer
    x = 542.11

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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.