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Finding the Fourth Proportional to 668.86, 1,000.77 and 395.10

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Solution

The fourth proportional to 668.86, 1,000.77 and 395.10 is: 591.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.86 : 1,000.77 = 395.10 : x
  2. Step 2: Convert to fraction form
    668.86/1,000.77 = 395.10/x
  3. Step 3: Cross multiply
    668.86x = 1,000.77 × 395.10
  4. Step 4: Simplify right side
    668.86x = 395,404.23
  5. Step 5: Solve for x
    x = 395,404.23/668.86
  6. Step 6: Final answer
    x = 591.16

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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.