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Finding the Fourth Proportional to 655.92, 985.80 and 612.60

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Solution

The fourth proportional to 655.92, 985.80 and 612.60 is: 920.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.92 : 985.80 = 612.60 : x
  2. Step 2: Convert to fraction form
    655.92/985.80 = 612.60/x
  3. Step 3: Cross multiply
    655.92x = 985.80 × 612.60
  4. Step 4: Simplify right side
    655.92x = 603,901.08
  5. Step 5: Solve for x
    x = 603,901.08/655.92
  6. Step 6: Final answer
    x = 920.69

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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.