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Finding the Fourth Proportional to 290.64, 400.07 and 253.74

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Solution

The fourth proportional to 290.64, 400.07 and 253.74 is: 349.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.64 : 400.07 = 253.74 : x
  2. Step 2: Convert to fraction form
    290.64/400.07 = 253.74/x
  3. Step 3: Cross multiply
    290.64x = 400.07 × 253.74
  4. Step 4: Simplify right side
    290.64x = 101,513.76
  5. Step 5: Solve for x
    x = 101,513.76/290.64
  6. Step 6: Final answer
    x = 349.28

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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.