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Finding the Fourth Proportional to 1,133.68, 1,563.60 and 820.12

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Solution

The fourth proportional to 1,133.68, 1,563.60 and 820.12 is: 1,131.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.68 : 1,563.60 = 820.12 : x
  2. Step 2: Convert to fraction form
    1,133.68/1,563.60 = 820.12/x
  3. Step 3: Cross multiply
    1,133.68x = 1,563.60 × 820.12
  4. Step 4: Simplify right side
    1,133.68x = 1,282,339.63
  5. Step 5: Solve for x
    x = 1,282,339.63/1,133.68
  6. Step 6: Final answer
    x = 1,131.13

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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.