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Finding the Fourth Proportional to 915.87, 1,374.26 and 429.27

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Solution

The fourth proportional to 915.87, 1,374.26 and 429.27 is: 644.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.87 : 1,374.26 = 429.27 : x
  2. Step 2: Convert to fraction form
    915.87/1,374.26 = 429.27/x
  3. Step 3: Cross multiply
    915.87x = 1,374.26 × 429.27
  4. Step 4: Simplify right side
    915.87x = 589,928.59
  5. Step 5: Solve for x
    x = 589,928.59/915.87
  6. Step 6: Final answer
    x = 644.12

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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.