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Finding the Fourth Proportional to 672.07, 1,007.62 and 260.86

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Solution

The fourth proportional to 672.07, 1,007.62 and 260.86 is: 391.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.07 : 1,007.62 = 260.86 : x
  2. Step 2: Convert to fraction form
    672.07/1,007.62 = 260.86/x
  3. Step 3: Cross multiply
    672.07x = 1,007.62 × 260.86
  4. Step 4: Simplify right side
    672.07x = 262,847.75
  5. Step 5: Solve for x
    x = 262,847.75/672.07
  6. Step 6: Final answer
    x = 391.10

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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.