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Finding the Fourth Proportional to 1,442.87, 2,162.05 and 856.70

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Solution

The fourth proportional to 1,442.87, 2,162.05 and 856.70 is: 1,283.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.87 : 2,162.05 = 856.70 : x
  2. Step 2: Convert to fraction form
    1,442.87/2,162.05 = 856.70/x
  3. Step 3: Cross multiply
    1,442.87x = 2,162.05 × 856.70
  4. Step 4: Simplify right side
    1,442.87x = 1,852,215.28
  5. Step 5: Solve for x
    x = 1,852,215.28/1,442.87
  6. Step 6: Final answer
    x = 1,283.71

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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.