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Finding the Fourth Proportional to 667.33, 920.43 and 578.65

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Solution

The fourth proportional to 667.33, 920.43 and 578.65 is: 798.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.33 : 920.43 = 578.65 : x
  2. Step 2: Convert to fraction form
    667.33/920.43 = 578.65/x
  3. Step 3: Cross multiply
    667.33x = 920.43 × 578.65
  4. Step 4: Simplify right side
    667.33x = 532,606.82
  5. Step 5: Solve for x
    x = 532,606.82/667.33
  6. Step 6: Final answer
    x = 798.12

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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.