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Finding the Fourth Proportional to 1,621.78, 2,430.98 and 852.82

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Solution

The fourth proportional to 1,621.78, 2,430.98 and 852.82 is: 1,278.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.78 : 2,430.98 = 852.82 : x
  2. Step 2: Convert to fraction form
    1,621.78/2,430.98 = 852.82/x
  3. Step 3: Cross multiply
    1,621.78x = 2,430.98 × 852.82
  4. Step 4: Simplify right side
    1,621.78x = 2,073,188.36
  5. Step 5: Solve for x
    x = 2,073,188.36/1,621.78
  6. Step 6: Final answer
    x = 1,278.34

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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.