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Finding the Fourth Proportional to 817.53, 1,128.98 and 698.81

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Solution

The fourth proportional to 817.53, 1,128.98 and 698.81 is: 965.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.53 : 1,128.98 = 698.81 : x
  2. Step 2: Convert to fraction form
    817.53/1,128.98 = 698.81/x
  3. Step 3: Cross multiply
    817.53x = 1,128.98 × 698.81
  4. Step 4: Simplify right side
    817.53x = 788,933.37
  5. Step 5: Solve for x
    x = 788,933.37/817.53
  6. Step 6: Final answer
    x = 965.02

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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.