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Finding the Fourth Proportional to 258.64, 388.08 and 130.40

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Solution

The fourth proportional to 258.64, 388.08 and 130.40 is: 195.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.64 : 388.08 = 130.40 : x
  2. Step 2: Convert to fraction form
    258.64/388.08 = 130.40/x
  3. Step 3: Cross multiply
    258.64x = 388.08 × 130.40
  4. Step 4: Simplify right side
    258.64x = 50,605.63
  5. Step 5: Solve for x
    x = 50,605.63/258.64
  6. Step 6: Final answer
    x = 195.66

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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.