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Finding the Fourth Proportional to 720.86, 1,078.97 and 373.72

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Solution

The fourth proportional to 720.86, 1,078.97 and 373.72 is: 559.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.86 : 1,078.97 = 373.72 : x
  2. Step 2: Convert to fraction form
    720.86/1,078.97 = 373.72/x
  3. Step 3: Cross multiply
    720.86x = 1,078.97 × 373.72
  4. Step 4: Simplify right side
    720.86x = 403,228.10
  5. Step 5: Solve for x
    x = 403,228.10/720.86
  6. Step 6: Final answer
    x = 559.37

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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.