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Finding the Fourth Proportional to 654.18, 902.85 and 392.16

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Solution

The fourth proportional to 654.18, 902.85 and 392.16 is: 541.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.18 : 902.85 = 392.16 : x
  2. Step 2: Convert to fraction form
    654.18/902.85 = 392.16/x
  3. Step 3: Cross multiply
    654.18x = 902.85 × 392.16
  4. Step 4: Simplify right side
    654.18x = 354,061.66
  5. Step 5: Solve for x
    x = 354,061.66/654.18
  6. Step 6: Final answer
    x = 541.23

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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.