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Finding the Fourth Proportional to 1,108.26, 1,529.64 and 642.60

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Solution

The fourth proportional to 1,108.26, 1,529.64 and 642.60 is: 886.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.26 : 1,529.64 = 642.60 : x
  2. Step 2: Convert to fraction form
    1,108.26/1,529.64 = 642.60/x
  3. Step 3: Cross multiply
    1,108.26x = 1,529.64 × 642.60
  4. Step 4: Simplify right side
    1,108.26x = 982,946.66
  5. Step 5: Solve for x
    x = 982,946.66/1,108.26
  6. Step 6: Final answer
    x = 886.93

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.