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Finding the Fourth Proportional to 118.40, 160.80 and 118.40

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Solution

The fourth proportional to 118.40, 160.80 and 118.40 is: 160.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.40 : 160.80 = 118.40 : x
  2. Step 2: Convert to fraction form
    118.40/160.80 = 118.40/x
  3. Step 3: Cross multiply
    118.40x = 160.80 × 118.40
  4. Step 4: Simplify right side
    118.40x = 19,038.72
  5. Step 5: Solve for x
    x = 19,038.72/118.40
  6. Step 6: Final answer
    x = 160.80

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.