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Finding the Fourth Proportional to 671.07, 1,005.12 and 515.86

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Solution

The fourth proportional to 671.07, 1,005.12 and 515.86 is: 772.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.07 : 1,005.12 = 515.86 : x
  2. Step 2: Convert to fraction form
    671.07/1,005.12 = 515.86/x
  3. Step 3: Cross multiply
    671.07x = 1,005.12 × 515.86
  4. Step 4: Simplify right side
    671.07x = 518,501.20
  5. Step 5: Solve for x
    x = 518,501.20/671.07
  6. Step 6: Final answer
    x = 772.65

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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.