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Finding the Fourth Proportional to 681.85, 1,021.42 and 437.50

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Solution

The fourth proportional to 681.85, 1,021.42 and 437.50 is: 655.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.85 : 1,021.42 = 437.50 : x
  2. Step 2: Convert to fraction form
    681.85/1,021.42 = 437.50/x
  3. Step 3: Cross multiply
    681.85x = 1,021.42 × 437.50
  4. Step 4: Simplify right side
    681.85x = 446,871.25
  5. Step 5: Solve for x
    x = 446,871.25/681.85
  6. Step 6: Final answer
    x = 655.38

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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.