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Finding the Fourth Proportional to 830.24, 1,243.56 and 781.78

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Solution

The fourth proportional to 830.24, 1,243.56 and 781.78 is: 1,170.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.24 : 1,243.56 = 781.78 : x
  2. Step 2: Convert to fraction form
    830.24/1,243.56 = 781.78/x
  3. Step 3: Cross multiply
    830.24x = 1,243.56 × 781.78
  4. Step 4: Simplify right side
    830.24x = 972,190.34
  5. Step 5: Solve for x
    x = 972,190.34/830.24
  6. Step 6: Final answer
    x = 1,170.98

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.