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Finding the Fourth Proportional to 1,435.19, 2,156.42 and 915.44

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Solution

The fourth proportional to 1,435.19, 2,156.42 and 915.44 is: 1,375.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.19 : 2,156.42 = 915.44 : x
  2. Step 2: Convert to fraction form
    1,435.19/2,156.42 = 915.44/x
  3. Step 3: Cross multiply
    1,435.19x = 2,156.42 × 915.44
  4. Step 4: Simplify right side
    1,435.19x = 1,974,064.63
  5. Step 5: Solve for x
    x = 1,974,064.63/1,435.19
  6. Step 6: Final answer
    x = 1,375.48

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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.