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Finding the Fourth Proportional to 1,188.66, 1,783.70 and 539.39

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Solution

The fourth proportional to 1,188.66, 1,783.70 and 539.39 is: 809.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.66 : 1,783.70 = 539.39 : x
  2. Step 2: Convert to fraction form
    1,188.66/1,783.70 = 539.39/x
  3. Step 3: Cross multiply
    1,188.66x = 1,783.70 × 539.39
  4. Step 4: Simplify right side
    1,188.66x = 962,098.33
  5. Step 5: Solve for x
    x = 962,098.33/1,188.66
  6. Step 6: Final answer
    x = 809.40

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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.