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Finding the Fourth Proportional to 915.44, 1,373.84 and 428.83

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Solution

The fourth proportional to 915.44, 1,373.84 and 428.83 is: 643.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.44 : 1,373.84 = 428.83 : x
  2. Step 2: Convert to fraction form
    915.44/1,373.84 = 428.83/x
  3. Step 3: Cross multiply
    915.44x = 1,373.84 × 428.83
  4. Step 4: Simplify right side
    915.44x = 589,143.81
  5. Step 5: Solve for x
    x = 589,143.81/915.44
  6. Step 6: Final answer
    x = 643.56

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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.