Home / 21,840.49-30,130.39-13,878.45

Finding the Fourth Proportional to 21,840.49, 30,130.39 and 13,878.45

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Solution

The fourth proportional to 21,840.49, 30,130.39 and 13,878.45 is: 19,146.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.49 : 30,130.39 = 13,878.45 : x
  2. Step 2: Convert to fraction form
    21,840.49/30,130.39 = 13,878.45/x
  3. Step 3: Cross multiply
    21,840.49x = 30,130.39 × 13,878.45
  4. Step 4: Simplify right side
    21,840.49x = 418,162,891.05
  5. Step 5: Solve for x
    x = 418,162,891.05/21,840.49
  6. Step 6: Final answer
    x = 19,146.22

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1.5x scale

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.