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Finding the Fourth Proportional to 655.85, 985.59 and 612.51

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Solution

The fourth proportional to 655.85, 985.59 and 612.51 is: 920.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.85 : 985.59 = 612.51 : x
  2. Step 2: Convert to fraction form
    655.85/985.59 = 612.51/x
  3. Step 3: Cross multiply
    655.85x = 985.59 × 612.51
  4. Step 4: Simplify right side
    655.85x = 603,683.73
  5. Step 5: Solve for x
    x = 603,683.73/655.85
  6. Step 6: Final answer
    x = 920.46

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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.