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Finding the Fourth Proportional to 1,260.32, 1,889.12 and 821.04

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Solution

The fourth proportional to 1,260.32, 1,889.12 and 821.04 is: 1,230.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.32 : 1,889.12 = 821.04 : x
  2. Step 2: Convert to fraction form
    1,260.32/1,889.12 = 821.04/x
  3. Step 3: Cross multiply
    1,260.32x = 1,889.12 × 821.04
  4. Step 4: Simplify right side
    1,260.32x = 1,551,043.08
  5. Step 5: Solve for x
    x = 1,551,043.08/1,260.32
  6. Step 6: Final answer
    x = 1,230.67

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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.