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Finding the Fourth Proportional to 305.40, 421.90 and 282.36

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Solution

The fourth proportional to 305.40, 421.90 and 282.36 is: 390.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.40 : 421.90 = 282.36 : x
  2. Step 2: Convert to fraction form
    305.40/421.90 = 282.36/x
  3. Step 3: Cross multiply
    305.40x = 421.90 × 282.36
  4. Step 4: Simplify right side
    305.40x = 119,127.68
  5. Step 5: Solve for x
    x = 119,127.68/305.40
  6. Step 6: Final answer
    x = 390.07

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.