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Finding the Fourth Proportional to 3,407.90, 4,702.90 and 1,915.88

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Solution

The fourth proportional to 3,407.90, 4,702.90 and 1,915.88 is: 2,643.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,407.90 : 4,702.90 = 1,915.88 : x
  2. Step 2: Convert to fraction form
    3,407.90/4,702.90 = 1,915.88/x
  3. Step 3: Cross multiply
    3,407.90x = 4,702.90 × 1,915.88
  4. Step 4: Simplify right side
    3,407.90x = 9,010,192.05
  5. Step 5: Solve for x
    x = 9,010,192.05/3,407.90
  6. Step 6: Final answer
    x = 2,643.91

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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.