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Finding the Fourth Proportional to 1,856.10, 2,780.10 and 1,815.60

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Solution

The fourth proportional to 1,856.10, 2,780.10 and 1,815.60 is: 2,719.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.10 : 2,780.10 = 1,815.60 : x
  2. Step 2: Convert to fraction form
    1,856.10/2,780.10 = 1,815.60/x
  3. Step 3: Cross multiply
    1,856.10x = 2,780.10 × 1,815.60
  4. Step 4: Simplify right side
    1,856.10x = 5,047,549.56
  5. Step 5: Solve for x
    x = 5,047,549.56/1,856.10
  6. Step 6: Final answer
    x = 2,719.44

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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.