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Finding the Fourth Proportional to 920.67, 1,380.20 and 486.51

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Solution

The fourth proportional to 920.67, 1,380.20 and 486.51 is: 729.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.67 : 1,380.20 = 486.51 : x
  2. Step 2: Convert to fraction form
    920.67/1,380.20 = 486.51/x
  3. Step 3: Cross multiply
    920.67x = 1,380.20 × 486.51
  4. Step 4: Simplify right side
    920.67x = 671,478.67
  5. Step 5: Solve for x
    x = 671,478.67/920.67
  6. Step 6: Final answer
    x = 729.34

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.