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Finding the Fourth Proportional to 1,189.09, 1,783.65 and 458.27

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Solution

The fourth proportional to 1,189.09, 1,783.65 and 458.27 is: 687.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.09 : 1,783.65 = 458.27 : x
  2. Step 2: Convert to fraction form
    1,189.09/1,783.65 = 458.27/x
  3. Step 3: Cross multiply
    1,189.09x = 1,783.65 × 458.27
  4. Step 4: Simplify right side
    1,189.09x = 817,393.29
  5. Step 5: Solve for x
    x = 817,393.29/1,189.09
  6. Step 6: Final answer
    x = 687.41

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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.