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Finding the Fourth Proportional to 810.81, 1,118.81 and 693.36

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Solution

The fourth proportional to 810.81, 1,118.81 and 693.36 is: 956.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.81 : 1,118.81 = 693.36 : x
  2. Step 2: Convert to fraction form
    810.81/1,118.81 = 693.36/x
  3. Step 3: Cross multiply
    810.81x = 1,118.81 × 693.36
  4. Step 4: Simplify right side
    810.81x = 775,739.84
  5. Step 5: Solve for x
    x = 775,739.84/810.81
  6. Step 6: Final answer
    x = 956.75

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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.