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Finding the Fourth Proportional to 354.99, 489.74 and 256.53

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Solution

The fourth proportional to 354.99, 489.74 and 256.53 is: 353.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.99 : 489.74 = 256.53 : x
  2. Step 2: Convert to fraction form
    354.99/489.74 = 256.53/x
  3. Step 3: Cross multiply
    354.99x = 489.74 × 256.53
  4. Step 4: Simplify right side
    354.99x = 125,633.00
  5. Step 5: Solve for x
    x = 125,633.00/354.99
  6. Step 6: Final answer
    x = 353.91

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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.