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Finding the Fourth Proportional to 667.08, 920.61 and 387.23

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Solution

The fourth proportional to 667.08, 920.61 and 387.23 is: 534.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.08 : 920.61 = 387.23 : x
  2. Step 2: Convert to fraction form
    667.08/920.61 = 387.23/x
  3. Step 3: Cross multiply
    667.08x = 920.61 × 387.23
  4. Step 4: Simplify right side
    667.08x = 356,483.21
  5. Step 5: Solve for x
    x = 356,483.21/667.08
  6. Step 6: Final answer
    x = 534.39

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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.