Home / 21,086.51-31,629.74-8,612.39

Finding the Fourth Proportional to 21,086.51, 31,629.74 and 8,612.39

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Solution

The fourth proportional to 21,086.51, 31,629.74 and 8,612.39 is: 12,918.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,086.51 : 31,629.74 = 8,612.39 : x
  2. Step 2: Convert to fraction form
    21,086.51/31,629.74 = 8,612.39/x
  3. Step 3: Cross multiply
    21,086.51x = 31,629.74 × 8,612.39
  4. Step 4: Simplify right side
    21,086.51x = 272,407,692.49
  5. Step 5: Solve for x
    x = 272,407,692.49/21,086.51
  6. Step 6: Final answer
    x = 12,918.58

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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.