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Finding the Fourth Proportional to 920.13, 1,380.20 and 407.13

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Solution

The fourth proportional to 920.13, 1,380.20 and 407.13 is: 610.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.13 : 1,380.20 = 407.13 : x
  2. Step 2: Convert to fraction form
    920.13/1,380.20 = 407.13/x
  3. Step 3: Cross multiply
    920.13x = 1,380.20 × 407.13
  4. Step 4: Simplify right side
    920.13x = 561,920.83
  5. Step 5: Solve for x
    x = 561,920.83/920.13
  6. Step 6: Final answer
    x = 610.70

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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.