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Finding the Fourth Proportional to 889.30, 1,330.46 and 785.42

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Solution

The fourth proportional to 889.30, 1,330.46 and 785.42 is: 1,175.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.30 : 1,330.46 = 785.42 : x
  2. Step 2: Convert to fraction form
    889.30/1,330.46 = 785.42/x
  3. Step 3: Cross multiply
    889.30x = 1,330.46 × 785.42
  4. Step 4: Simplify right side
    889.30x = 1,044,974.30
  5. Step 5: Solve for x
    x = 1,044,974.30/889.30
  6. Step 6: Final answer
    x = 1,175.05

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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.