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Finding the Fourth Proportional to 816.52, 1,218.43 and 720.52

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Solution

The fourth proportional to 816.52, 1,218.43 and 720.52 is: 1,075.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.52 : 1,218.43 = 720.52 : x
  2. Step 2: Convert to fraction form
    816.52/1,218.43 = 720.52/x
  3. Step 3: Cross multiply
    816.52x = 1,218.43 × 720.52
  4. Step 4: Simplify right side
    816.52x = 877,903.18
  5. Step 5: Solve for x
    x = 877,903.18/816.52
  6. Step 6: Final answer
    x = 1,075.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.