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Finding the Fourth Proportional to 671.76, 926.90 and 485.54

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Solution

The fourth proportional to 671.76, 926.90 and 485.54 is: 669.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.76 : 926.90 = 485.54 : x
  2. Step 2: Convert to fraction form
    671.76/926.90 = 485.54/x
  3. Step 3: Cross multiply
    671.76x = 926.90 × 485.54
  4. Step 4: Simplify right side
    671.76x = 450,039.96
  5. Step 5: Solve for x
    x = 450,039.96/671.76
  6. Step 6: Final answer
    x = 669.94

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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.