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Finding the Fourth Proportional to 671.88, 920.50 and 645.96

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Solution

The fourth proportional to 671.88, 920.50 and 645.96 is: 884.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.88 : 920.50 = 645.96 : x
  2. Step 2: Convert to fraction form
    671.88/920.50 = 645.96/x
  3. Step 3: Cross multiply
    671.88x = 920.50 × 645.96
  4. Step 4: Simplify right side
    671.88x = 594,602.95
  5. Step 5: Solve for x
    x = 594,602.95/671.88
  6. Step 6: Final answer
    x = 884.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.