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Finding the Fourth Proportional to 641.04, 890.70 and 634.26

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Solution

The fourth proportional to 641.04, 890.70 and 634.26 is: 881.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.04 : 890.70 = 634.26 : x
  2. Step 2: Convert to fraction form
    641.04/890.70 = 634.26/x
  3. Step 3: Cross multiply
    641.04x = 890.70 × 634.26
  4. Step 4: Simplify right side
    641.04x = 564,935.38
  5. Step 5: Solve for x
    x = 564,935.38/641.04
  6. Step 6: Final answer
    x = 881.28

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Half scale
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Double scale
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1.5x scale

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.