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Finding the Fourth Proportional to 679.62, 1,018.46 and 612.18

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Solution

The fourth proportional to 679.62, 1,018.46 and 612.18 is: 917.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.62 : 1,018.46 = 612.18 : x
  2. Step 2: Convert to fraction form
    679.62/1,018.46 = 612.18/x
  3. Step 3: Cross multiply
    679.62x = 1,018.46 × 612.18
  4. Step 4: Simplify right side
    679.62x = 623,480.84
  5. Step 5: Solve for x
    x = 623,480.84/679.62
  6. Step 6: Final answer
    x = 917.40

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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.