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Finding the Fourth Proportional to 281.51, 420.63 and 247.68

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Solution

The fourth proportional to 281.51, 420.63 and 247.68 is: 370.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.51 : 420.63 = 247.68 : x
  2. Step 2: Convert to fraction form
    281.51/420.63 = 247.68/x
  3. Step 3: Cross multiply
    281.51x = 420.63 × 247.68
  4. Step 4: Simplify right side
    281.51x = 104,182.94
  5. Step 5: Solve for x
    x = 104,182.94/281.51
  6. Step 6: Final answer
    x = 370.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.