Home / 2,115.18-3,172.80-654.33

Finding the Fourth Proportional to 2,115.18, 3,172.80 and 654.33

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Solution

The fourth proportional to 2,115.18, 3,172.80 and 654.33 is: 981.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.18 : 3,172.80 = 654.33 : x
  2. Step 2: Convert to fraction form
    2,115.18/3,172.80 = 654.33/x
  3. Step 3: Cross multiply
    2,115.18x = 3,172.80 × 654.33
  4. Step 4: Simplify right side
    2,115.18x = 2,076,058.22
  5. Step 5: Solve for x
    x = 2,076,058.22/2,115.18
  6. Step 6: Final answer
    x = 981.50

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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.