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Finding the Fourth Proportional to 130.78, 179.48 and 118.47

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Solution

The fourth proportional to 130.78, 179.48 and 118.47 is: 162.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.78 : 179.48 = 118.47 : x
  2. Step 2: Convert to fraction form
    130.78/179.48 = 118.47/x
  3. Step 3: Cross multiply
    130.78x = 179.48 × 118.47
  4. Step 4: Simplify right side
    130.78x = 21,262.40
  5. Step 5: Solve for x
    x = 21,262.40/130.78
  6. Step 6: Final answer
    x = 162.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.