Home / 21,640.84-29,880.18-13,988.64

Finding the Fourth Proportional to 21,640.84, 29,880.18 and 13,988.64

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Solution

The fourth proportional to 21,640.84, 29,880.18 and 13,988.64 is: 19,314.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,640.84 : 29,880.18 = 13,988.64 : x
  2. Step 2: Convert to fraction form
    21,640.84/29,880.18 = 13,988.64/x
  3. Step 3: Cross multiply
    21,640.84x = 29,880.18 × 13,988.64
  4. Step 4: Simplify right side
    21,640.84x = 417,983,081.16
  5. Step 5: Solve for x
    x = 417,983,081.16/21,640.84
  6. Step 6: Final answer
    x = 19,314.55

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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.