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Finding the Fourth Proportional to 654.72, 903.36 and 392.74

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Solution

The fourth proportional to 654.72, 903.36 and 392.74 is: 541.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.72 : 903.36 = 392.74 : x
  2. Step 2: Convert to fraction form
    654.72/903.36 = 392.74/x
  3. Step 3: Cross multiply
    654.72x = 903.36 × 392.74
  4. Step 4: Simplify right side
    654.72x = 354,785.61
  5. Step 5: Solve for x
    x = 354,785.61/654.72
  6. Step 6: Final answer
    x = 541.89

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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.