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Finding the Fourth Proportional to 920.55, 1,379.61 and 372.08

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Solution

The fourth proportional to 920.55, 1,379.61 and 372.08 is: 557.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.55 : 1,379.61 = 372.08 : x
  2. Step 2: Convert to fraction form
    920.55/1,379.61 = 372.08/x
  3. Step 3: Cross multiply
    920.55x = 1,379.61 × 372.08
  4. Step 4: Simplify right side
    920.55x = 513,325.29
  5. Step 5: Solve for x
    x = 513,325.29/920.55
  6. Step 6: Final answer
    x = 557.63

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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.