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Finding the Fourth Proportional to 1,915.76, 2,640.30 and 1,390.88

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Solution

The fourth proportional to 1,915.76, 2,640.30 and 1,390.88 is: 1,916.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.76 : 2,640.30 = 1,390.88 : x
  2. Step 2: Convert to fraction form
    1,915.76/2,640.30 = 1,390.88/x
  3. Step 3: Cross multiply
    1,915.76x = 2,640.30 × 1,390.88
  4. Step 4: Simplify right side
    1,915.76x = 3,672,340.46
  5. Step 5: Solve for x
    x = 3,672,340.46/1,915.76
  6. Step 6: Final answer
    x = 1,916.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.