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Finding the Fourth Proportional to 887.09, 1,330.63 and 820.13

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Solution

The fourth proportional to 887.09, 1,330.63 and 820.13 is: 1,230.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.09 : 1,330.63 = 820.13 : x
  2. Step 2: Convert to fraction form
    887.09/1,330.63 = 820.13/x
  3. Step 3: Cross multiply
    887.09x = 1,330.63 × 820.13
  4. Step 4: Simplify right side
    887.09x = 1,091,280.88
  5. Step 5: Solve for x
    x = 1,091,280.88/887.09
  6. Step 6: Final answer
    x = 1,230.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.