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Finding the Fourth Proportional to 1,245.21, 1,865.70 and 878.22

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Solution

The fourth proportional to 1,245.21, 1,865.70 and 878.22 is: 1,315.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.21 : 1,865.70 = 878.22 : x
  2. Step 2: Convert to fraction form
    1,245.21/1,865.70 = 878.22/x
  3. Step 3: Cross multiply
    1,245.21x = 1,865.70 × 878.22
  4. Step 4: Simplify right side
    1,245.21x = 1,638,495.05
  5. Step 5: Solve for x
    x = 1,638,495.05/1,245.21
  6. Step 6: Final answer
    x = 1,315.84

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1.5x scale

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.