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Finding the Fourth Proportional to 810.56, 1,118.81 and 717.62

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Solution

The fourth proportional to 810.56, 1,118.81 and 717.62 is: 990.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.56 : 1,118.81 = 717.62 : x
  2. Step 2: Convert to fraction form
    810.56/1,118.81 = 717.62/x
  3. Step 3: Cross multiply
    810.56x = 1,118.81 × 717.62
  4. Step 4: Simplify right side
    810.56x = 802,876.63
  5. Step 5: Solve for x
    x = 802,876.63/810.56
  6. Step 6: Final answer
    x = 990.52

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Why These Related Problems?

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