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Finding the Fourth Proportional to 245.40, 368.21 and 123.60

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Solution

The fourth proportional to 245.40, 368.21 and 123.60 is: 185.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.40 : 368.21 = 123.60 : x
  2. Step 2: Convert to fraction form
    245.40/368.21 = 123.60/x
  3. Step 3: Cross multiply
    245.40x = 368.21 × 123.60
  4. Step 4: Simplify right side
    245.40x = 45,510.14
  5. Step 5: Solve for x
    x = 45,510.14/245.40
  6. Step 6: Final answer
    x = 185.45

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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.