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Finding the Fourth Proportional to 899.20, 1,242.57 and 810.64

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Solution

The fourth proportional to 899.20, 1,242.57 and 810.64 is: 1,120.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.20 : 1,242.57 = 810.64 : x
  2. Step 2: Convert to fraction form
    899.20/1,242.57 = 810.64/x
  3. Step 3: Cross multiply
    899.20x = 1,242.57 × 810.64
  4. Step 4: Simplify right side
    899.20x = 1,007,276.94
  5. Step 5: Solve for x
    x = 1,007,276.94/899.20
  6. Step 6: Final answer
    x = 1,120.19

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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.