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Finding the Fourth Proportional to 1,191.45, 1,785.15 and 643.08

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Solution

The fourth proportional to 1,191.45, 1,785.15 and 643.08 is: 963.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.45 : 1,785.15 = 643.08 : x
  2. Step 2: Convert to fraction form
    1,191.45/1,785.15 = 643.08/x
  3. Step 3: Cross multiply
    1,191.45x = 1,785.15 × 643.08
  4. Step 4: Simplify right side
    1,191.45x = 1,147,994.26
  5. Step 5: Solve for x
    x = 1,147,994.26/1,191.45
  6. Step 6: Final answer
    x = 963.53

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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.