Home / 1,985.80-2,740.40-1,101.60

Finding the Fourth Proportional to 1,985.80, 2,740.40 and 1,101.60

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Solution

The fourth proportional to 1,985.80, 2,740.40 and 1,101.60 is: 1,520.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.80 : 2,740.40 = 1,101.60 : x
  2. Step 2: Convert to fraction form
    1,985.80/2,740.40 = 1,101.60/x
  3. Step 3: Cross multiply
    1,985.80x = 2,740.40 × 1,101.60
  4. Step 4: Simplify right side
    1,985.80x = 3,018,824.64
  5. Step 5: Solve for x
    x = 3,018,824.64/1,985.80
  6. Step 6: Final answer
    x = 1,520.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.