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Finding the Fourth Proportional to 693.51, 1,040.76 and 419.73

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Solution

The fourth proportional to 693.51, 1,040.76 and 419.73 is: 629.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.51 : 1,040.76 = 419.73 : x
  2. Step 2: Convert to fraction form
    693.51/1,040.76 = 419.73/x
  3. Step 3: Cross multiply
    693.51x = 1,040.76 × 419.73
  4. Step 4: Simplify right side
    693.51x = 436,838.19
  5. Step 5: Solve for x
    x = 436,838.19/693.51
  6. Step 6: Final answer
    x = 629.89

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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.