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Finding the Fourth Proportional to 354.51, 488.61 and 256.14

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Solution

The fourth proportional to 354.51, 488.61 and 256.14 is: 353.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.51 : 488.61 = 256.14 : x
  2. Step 2: Convert to fraction form
    354.51/488.61 = 256.14/x
  3. Step 3: Cross multiply
    354.51x = 488.61 × 256.14
  4. Step 4: Simplify right side
    354.51x = 125,152.57
  5. Step 5: Solve for x
    x = 125,152.57/354.51
  6. Step 6: Final answer
    x = 353.03

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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.