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Finding the Fourth Proportional to 655.02, 981.87 and 420.94

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Solution

The fourth proportional to 655.02, 981.87 and 420.94 is: 630.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.02 : 981.87 = 420.94 : x
  2. Step 2: Convert to fraction form
    655.02/981.87 = 420.94/x
  3. Step 3: Cross multiply
    655.02x = 981.87 × 420.94
  4. Step 4: Simplify right side
    655.02x = 413,309.68
  5. Step 5: Solve for x
    x = 413,309.68/655.02
  6. Step 6: Final answer
    x = 630.99

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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.