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Finding the Fourth Proportional to 1,420.56, 2,130.78 and 843

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Solution

The fourth proportional to 1,420.56, 2,130.78 and 843 is: 1,264.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.56 : 2,130.78 = 843 : x
  2. Step 2: Convert to fraction form
    1,420.56/2,130.78 = 843/x
  3. Step 3: Cross multiply
    1,420.56x = 2,130.78 × 843
  4. Step 4: Simplify right side
    1,420.56x = 1,796,247.54
  5. Step 5: Solve for x
    x = 1,796,247.54/1,420.56
  6. Step 6: Final answer
    x = 1,264.46

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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.