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Finding the Fourth Proportional to 654.19, 902.81 and 392.22

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Solution

The fourth proportional to 654.19, 902.81 and 392.22 is: 541.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.19 : 902.81 = 392.22 : x
  2. Step 2: Convert to fraction form
    654.19/902.81 = 392.22/x
  3. Step 3: Cross multiply
    654.19x = 902.81 × 392.22
  4. Step 4: Simplify right side
    654.19x = 354,101.12
  5. Step 5: Solve for x
    x = 354,101.12/654.19
  6. Step 6: Final answer
    x = 541.28

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Double scale
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Similar ratio
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1.5x scale

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.