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Finding the Fourth Proportional to 405.60, 608.54 and 145.60

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Solution

The fourth proportional to 405.60, 608.54 and 145.60 is: 218.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.60 : 608.54 = 145.60 : x
  2. Step 2: Convert to fraction form
    405.60/608.54 = 145.60/x
  3. Step 3: Cross multiply
    405.60x = 608.54 × 145.60
  4. Step 4: Simplify right side
    405.60x = 88,603.42
  5. Step 5: Solve for x
    x = 88,603.42/405.60
  6. Step 6: Final answer
    x = 218.45

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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.