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Finding the Fourth Proportional to 915.51, 1,372.40 and 298.79

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Solution

The fourth proportional to 915.51, 1,372.40 and 298.79 is: 447.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.51 : 1,372.40 = 298.79 : x
  2. Step 2: Convert to fraction form
    915.51/1,372.40 = 298.79/x
  3. Step 3: Cross multiply
    915.51x = 1,372.40 × 298.79
  4. Step 4: Simplify right side
    915.51x = 410,059.40
  5. Step 5: Solve for x
    x = 410,059.40/915.51
  6. Step 6: Final answer
    x = 447.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.