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Finding the Fourth Proportional to 607.90, 911.10 and 412.90

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Solution

The fourth proportional to 607.90, 911.10 and 412.90 is: 618.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.90 : 911.10 = 412.90 : x
  2. Step 2: Convert to fraction form
    607.90/911.10 = 412.90/x
  3. Step 3: Cross multiply
    607.90x = 911.10 × 412.90
  4. Step 4: Simplify right side
    607.90x = 376,193.19
  5. Step 5: Solve for x
    x = 376,193.19/607.90
  6. Step 6: Final answer
    x = 618.84

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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.