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Finding the Fourth Proportional to 1,189.81, 1,784.40 and 459.19

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Solution

The fourth proportional to 1,189.81, 1,784.40 and 459.19 is: 688.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.81 : 1,784.40 = 459.19 : x
  2. Step 2: Convert to fraction form
    1,189.81/1,784.40 = 459.19/x
  3. Step 3: Cross multiply
    1,189.81x = 1,784.40 × 459.19
  4. Step 4: Simplify right side
    1,189.81x = 819,378.64
  5. Step 5: Solve for x
    x = 819,378.64/1,189.81
  6. Step 6: Final answer
    x = 688.66

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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.