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Finding the Fourth Proportional to 693.85, 1,039.87 and 282.50

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Solution

The fourth proportional to 693.85, 1,039.87 and 282.50 is: 423.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.85 : 1,039.87 = 282.50 : x
  2. Step 2: Convert to fraction form
    693.85/1,039.87 = 282.50/x
  3. Step 3: Cross multiply
    693.85x = 1,039.87 × 282.50
  4. Step 4: Simplify right side
    693.85x = 293,763.28
  5. Step 5: Solve for x
    x = 293,763.28/693.85
  6. Step 6: Final answer
    x = 423.38

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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.