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Finding the Fourth Proportional to 644.59, 895.71 and 637.90

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Solution

The fourth proportional to 644.59, 895.71 and 637.90 is: 886.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.59 : 895.71 = 637.90 : x
  2. Step 2: Convert to fraction form
    644.59/895.71 = 637.90/x
  3. Step 3: Cross multiply
    644.59x = 895.71 × 637.90
  4. Step 4: Simplify right side
    644.59x = 571,370.22
  5. Step 5: Solve for x
    x = 571,370.22/644.59
  6. Step 6: Final answer
    x = 886.41

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.