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Finding the Fourth Proportional to 905.42, 1,357.46 and 612.20

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Solution

The fourth proportional to 905.42, 1,357.46 and 612.20 is: 917.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.42 : 1,357.46 = 612.20 : x
  2. Step 2: Convert to fraction form
    905.42/1,357.46 = 612.20/x
  3. Step 3: Cross multiply
    905.42x = 1,357.46 × 612.20
  4. Step 4: Simplify right side
    905.42x = 831,027.16
  5. Step 5: Solve for x
    x = 831,027.16/905.42
  6. Step 6: Final answer
    x = 917.84

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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.