Home / 21,940.47-30,283.88-12,988.35

Finding the Fourth Proportional to 21,940.47, 30,283.88 and 12,988.35

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Solution

The fourth proportional to 21,940.47, 30,283.88 and 12,988.35 is: 17,927.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.47 : 30,283.88 = 12,988.35 : x
  2. Step 2: Convert to fraction form
    21,940.47/30,283.88 = 12,988.35/x
  3. Step 3: Cross multiply
    21,940.47x = 30,283.88 × 12,988.35
  4. Step 4: Simplify right side
    21,940.47x = 393,337,567.86
  5. Step 5: Solve for x
    x = 393,337,567.86/21,940.47
  6. Step 6: Final answer
    x = 17,927.49

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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.