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Finding the Fourth Proportional to 405.36, 608.08 and 148.80

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Solution

The fourth proportional to 405.36, 608.08 and 148.80 is: 223.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.36 : 608.08 = 148.80 : x
  2. Step 2: Convert to fraction form
    405.36/608.08 = 148.80/x
  3. Step 3: Cross multiply
    405.36x = 608.08 × 148.80
  4. Step 4: Simplify right side
    405.36x = 90,482.30
  5. Step 5: Solve for x
    x = 90,482.30/405.36
  6. Step 6: Final answer
    x = 223.21

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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.