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Finding the Fourth Proportional to 1,325.73, 1,989.08 and 641.25

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Solution

The fourth proportional to 1,325.73, 1,989.08 and 641.25 is: 962.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.73 : 1,989.08 = 641.25 : x
  2. Step 2: Convert to fraction form
    1,325.73/1,989.08 = 641.25/x
  3. Step 3: Cross multiply
    1,325.73x = 1,989.08 × 641.25
  4. Step 4: Simplify right side
    1,325.73x = 1,275,494.34
  5. Step 5: Solve for x
    x = 1,275,494.34/1,325.73
  6. Step 6: Final answer
    x = 962.11

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1.5x scale

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.