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Finding the Fourth Proportional to 290.84, 400.38 and 253.98

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Solution

The fourth proportional to 290.84, 400.38 and 253.98 is: 349.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.84 : 400.38 = 253.98 : x
  2. Step 2: Convert to fraction form
    290.84/400.38 = 253.98/x
  3. Step 3: Cross multiply
    290.84x = 400.38 × 253.98
  4. Step 4: Simplify right side
    290.84x = 101,688.51
  5. Step 5: Solve for x
    x = 101,688.51/290.84
  6. Step 6: Final answer
    x = 349.64

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Why These Related Problems?

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