Home / 21,669.12-29,918.08-13,718.40

Finding the Fourth Proportional to 21,669.12, 29,918.08 and 13,718.40

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Solution

The fourth proportional to 21,669.12, 29,918.08 and 13,718.40 is: 18,940.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,669.12 : 29,918.08 = 13,718.40 : x
  2. Step 2: Convert to fraction form
    21,669.12/29,918.08 = 13,718.40/x
  3. Step 3: Cross multiply
    21,669.12x = 29,918.08 × 13,718.40
  4. Step 4: Simplify right side
    21,669.12x = 410,428,188.67
  5. Step 5: Solve for x
    x = 410,428,188.67/21,669.12
  6. Step 6: Final answer
    x = 18,940.69

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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.