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Finding the Fourth Proportional to 1,191.93, 1,789.01 and 644.54

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Solution

The fourth proportional to 1,191.93, 1,789.01 and 644.54 is: 967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.93 : 1,789.01 = 644.54 : x
  2. Step 2: Convert to fraction form
    1,191.93/1,789.01 = 644.54/x
  3. Step 3: Cross multiply
    1,191.93x = 1,789.01 × 644.54
  4. Step 4: Simplify right side
    1,191.93x = 1,153,076.34
  5. Step 5: Solve for x
    x = 1,153,076.34/1,191.93
  6. Step 6: Final answer
    x = 967.40

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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.