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Finding the Fourth Proportional to 30.42, 45.50 and 28.50

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Solution

The fourth proportional to 30.42, 45.50 and 28.50 is: 42.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.42 : 45.50 = 28.50 : x
  2. Step 2: Convert to fraction form
    30.42/45.50 = 28.50/x
  3. Step 3: Cross multiply
    30.42x = 45.50 × 28.50
  4. Step 4: Simplify right side
    30.42x = 1,296.52
  5. Step 5: Solve for x
    x = 1,296.52/30.42
  6. Step 6: Final answer
    x = 42.62

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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.