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Finding the Fourth Proportional to 671.81, 928.29 and 644.47

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Solution

The fourth proportional to 671.81, 928.29 and 644.47 is: 890.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.81 : 928.29 = 644.47 : x
  2. Step 2: Convert to fraction form
    671.81/928.29 = 644.47/x
  3. Step 3: Cross multiply
    671.81x = 928.29 × 644.47
  4. Step 4: Simplify right side
    671.81x = 598,255.15
  5. Step 5: Solve for x
    x = 598,255.15/671.81
  6. Step 6: Final answer
    x = 890.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.