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Finding the Fourth Proportional to 920.47, 1,379.93 and 400.08

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Solution

The fourth proportional to 920.47, 1,379.93 and 400.08 is: 599.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.47 : 1,379.93 = 400.08 : x
  2. Step 2: Convert to fraction form
    920.47/1,379.93 = 400.08/x
  3. Step 3: Cross multiply
    920.47x = 1,379.93 × 400.08
  4. Step 4: Simplify right side
    920.47x = 552,082.39
  5. Step 5: Solve for x
    x = 552,082.39/920.47
  6. Step 6: Final answer
    x = 599.78

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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.