Home / 21,918.90-30,245.60-12,963.14

Finding the Fourth Proportional to 21,918.90, 30,245.60 and 12,963.14

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Solution

The fourth proportional to 21,918.90, 30,245.60 and 12,963.14 is: 17,887.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.90 : 30,245.60 = 12,963.14 : x
  2. Step 2: Convert to fraction form
    21,918.90/30,245.60 = 12,963.14/x
  3. Step 3: Cross multiply
    21,918.90x = 30,245.60 × 12,963.14
  4. Step 4: Simplify right side
    21,918.90x = 392,077,941.78
  5. Step 5: Solve for x
    x = 392,077,941.78/21,918.90
  6. Step 6: Final answer
    x = 17,887.66

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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.