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Finding the Fourth Proportional to 1,220.85, 1,820.16 and 1,104.21

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Solution

The fourth proportional to 1,220.85, 1,820.16 and 1,104.21 is: 1,646.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.85 : 1,820.16 = 1,104.21 : x
  2. Step 2: Convert to fraction form
    1,220.85/1,820.16 = 1,104.21/x
  3. Step 3: Cross multiply
    1,220.85x = 1,820.16 × 1,104.21
  4. Step 4: Simplify right side
    1,220.85x = 2,009,838.87
  5. Step 5: Solve for x
    x = 2,009,838.87/1,220.85
  6. Step 6: Final answer
    x = 1,646.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.