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Finding the Fourth Proportional to 1,189.60, 1,782.10 and 981.68

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Solution

The fourth proportional to 1,189.60, 1,782.10 and 981.68 is: 1,470.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.60 : 1,782.10 = 981.68 : x
  2. Step 2: Convert to fraction form
    1,189.60/1,782.10 = 981.68/x
  3. Step 3: Cross multiply
    1,189.60x = 1,782.10 × 981.68
  4. Step 4: Simplify right side
    1,189.60x = 1,749,456.77
  5. Step 5: Solve for x
    x = 1,749,456.77/1,189.60
  6. Step 6: Final answer
    x = 1,470.63

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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.