Home / 1,985.12-2,972.80-1,636.32

Finding the Fourth Proportional to 1,985.12, 2,972.80 and 1,636.32

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Solution

The fourth proportional to 1,985.12, 2,972.80 and 1,636.32 is: 2,450.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.12 : 2,972.80 = 1,636.32 : x
  2. Step 2: Convert to fraction form
    1,985.12/2,972.80 = 1,636.32/x
  3. Step 3: Cross multiply
    1,985.12x = 2,972.80 × 1,636.32
  4. Step 4: Simplify right side
    1,985.12x = 4,864,452.10
  5. Step 5: Solve for x
    x = 4,864,452.10/1,985.12
  6. Step 6: Final answer
    x = 2,450.46

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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.