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Finding the Fourth Proportional to 612.42, 917.66 and 490.64

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Solution

The fourth proportional to 612.42, 917.66 and 490.64 is: 735.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.42 : 917.66 = 490.64 : x
  2. Step 2: Convert to fraction form
    612.42/917.66 = 490.64/x
  3. Step 3: Cross multiply
    612.42x = 917.66 × 490.64
  4. Step 4: Simplify right side
    612.42x = 450,240.70
  5. Step 5: Solve for x
    x = 450,240.70/612.42
  6. Step 6: Final answer
    x = 735.18

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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.