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Finding the Fourth Proportional to 3,916.80, 5,878.08 and 1,970.40

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Solution

The fourth proportional to 3,916.80, 5,878.08 and 1,970.40 is: 2,957.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,916.80 : 5,878.08 = 1,970.40 : x
  2. Step 2: Convert to fraction form
    3,916.80/5,878.08 = 1,970.40/x
  3. Step 3: Cross multiply
    3,916.80x = 5,878.08 × 1,970.40
  4. Step 4: Simplify right side
    3,916.80x = 11,582,168.83
  5. Step 5: Solve for x
    x = 11,582,168.83/3,916.80
  6. Step 6: Final answer
    x = 2,957.05

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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.