Home / 21,913.78-30,243.14-12,964.16

Finding the Fourth Proportional to 21,913.78, 30,243.14 and 12,964.16

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Solution

The fourth proportional to 21,913.78, 30,243.14 and 12,964.16 is: 17,891.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,913.78 : 30,243.14 = 12,964.16 : x
  2. Step 2: Convert to fraction form
    21,913.78/30,243.14 = 12,964.16/x
  3. Step 3: Cross multiply
    21,913.78x = 30,243.14 × 12,964.16
  4. Step 4: Simplify right side
    21,913.78x = 392,076,905.86
  5. Step 5: Solve for x
    x = 392,076,905.86/21,913.78
  6. Step 6: Final answer
    x = 17,891.80

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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.