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Finding the Fourth Proportional to 655.81, 977.98 and 641.77

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Solution

The fourth proportional to 655.81, 977.98 and 641.77 is: 957.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.81 : 977.98 = 641.77 : x
  2. Step 2: Convert to fraction form
    655.81/977.98 = 641.77/x
  3. Step 3: Cross multiply
    655.81x = 977.98 × 641.77
  4. Step 4: Simplify right side
    655.81x = 627,638.22
  5. Step 5: Solve for x
    x = 627,638.22/655.81
  6. Step 6: Final answer
    x = 957.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.