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Finding the Fourth Proportional to 245.66, 368.42 and 72.28

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Solution

The fourth proportional to 245.66, 368.42 and 72.28 is: 108.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.66 : 368.42 = 72.28 : x
  2. Step 2: Convert to fraction form
    245.66/368.42 = 72.28/x
  3. Step 3: Cross multiply
    245.66x = 368.42 × 72.28
  4. Step 4: Simplify right side
    245.66x = 26,629.40
  5. Step 5: Solve for x
    x = 26,629.40/245.66
  6. Step 6: Final answer
    x = 108.40

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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.