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Finding the Fourth Proportional to 915.63, 1,373.40 and 299.31

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Solution

The fourth proportional to 915.63, 1,373.40 and 299.31 is: 448.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.63 : 1,373.40 = 299.31 : x
  2. Step 2: Convert to fraction form
    915.63/1,373.40 = 299.31/x
  3. Step 3: Cross multiply
    915.63x = 1,373.40 × 299.31
  4. Step 4: Simplify right side
    915.63x = 411,072.35
  5. Step 5: Solve for x
    x = 411,072.35/915.63
  6. Step 6: Final answer
    x = 448.95

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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.