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Finding the Fourth Proportional to 654.31, 981.15 and 380.50

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Solution

The fourth proportional to 654.31, 981.15 and 380.50 is: 570.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.31 : 981.15 = 380.50 : x
  2. Step 2: Convert to fraction form
    654.31/981.15 = 380.50/x
  3. Step 3: Cross multiply
    654.31x = 981.15 × 380.50
  4. Step 4: Simplify right side
    654.31x = 373,323.70
  5. Step 5: Solve for x
    x = 373,323.70/654.31
  6. Step 6: Final answer
    x = 570.56

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.