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Finding the Fourth Proportional to 1,085.96, 1,498.34 and 643.96

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Solution

The fourth proportional to 1,085.96, 1,498.34 and 643.96 is: 888.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.96 : 1,498.34 = 643.96 : x
  2. Step 2: Convert to fraction form
    1,085.96/1,498.34 = 643.96/x
  3. Step 3: Cross multiply
    1,085.96x = 1,498.34 × 643.96
  4. Step 4: Simplify right side
    1,085.96x = 964,871.03
  5. Step 5: Solve for x
    x = 964,871.03/1,085.96
  6. Step 6: Final answer
    x = 888.50

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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.