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Finding the Fourth Proportional to 816.56, 1,128.84 and 782.36

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Solution

The fourth proportional to 816.56, 1,128.84 and 782.36 is: 1,081.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.56 : 1,128.84 = 782.36 : x
  2. Step 2: Convert to fraction form
    816.56/1,128.84 = 782.36/x
  3. Step 3: Cross multiply
    816.56x = 1,128.84 × 782.36
  4. Step 4: Simplify right side
    816.56x = 883,159.26
  5. Step 5: Solve for x
    x = 883,159.26/816.56
  6. Step 6: Final answer
    x = 1,081.56

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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.