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Finding the Fourth Proportional to 920.81, 1,379.37 and 457.19

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Solution

The fourth proportional to 920.81, 1,379.37 and 457.19 is: 684.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.81 : 1,379.37 = 457.19 : x
  2. Step 2: Convert to fraction form
    920.81/1,379.37 = 457.19/x
  3. Step 3: Cross multiply
    920.81x = 1,379.37 × 457.19
  4. Step 4: Simplify right side
    920.81x = 630,632.87
  5. Step 5: Solve for x
    x = 630,632.87/920.81
  6. Step 6: Final answer
    x = 684.87

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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.