Home / 21,840.39-30,139.74-11,904.39

Finding the Fourth Proportional to 21,840.39, 30,139.74 and 11,904.39

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Solution

The fourth proportional to 21,840.39, 30,139.74 and 11,904.39 is: 16,428.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.39 : 30,139.74 = 11,904.39 : x
  2. Step 2: Convert to fraction form
    21,840.39/30,139.74 = 11,904.39/x
  3. Step 3: Cross multiply
    21,840.39x = 30,139.74 × 11,904.39
  4. Step 4: Simplify right side
    21,840.39x = 358,795,219.46
  5. Step 5: Solve for x
    x = 358,795,219.46/21,840.39
  6. Step 6: Final answer
    x = 16,428.06

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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.