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Finding the Fourth Proportional to 1,320.49, 1,980.91 and 852.34

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Solution

The fourth proportional to 1,320.49, 1,980.91 and 852.34 is: 1,278.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.49 : 1,980.91 = 852.34 : x
  2. Step 2: Convert to fraction form
    1,320.49/1,980.91 = 852.34/x
  3. Step 3: Cross multiply
    1,320.49x = 1,980.91 × 852.34
  4. Step 4: Simplify right side
    1,320.49x = 1,688,394.66
  5. Step 5: Solve for x
    x = 1,688,394.66/1,320.49
  6. Step 6: Final answer
    x = 1,278.61

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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.