Home / 21,938.76-30,281.58-12,989.34

Finding the Fourth Proportional to 21,938.76, 30,281.58 and 12,989.34

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Solution

The fourth proportional to 21,938.76, 30,281.58 and 12,989.34 is: 17,928.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,938.76 : 30,281.58 = 12,989.34 : x
  2. Step 2: Convert to fraction form
    21,938.76/30,281.58 = 12,989.34/x
  3. Step 3: Cross multiply
    21,938.76x = 30,281.58 × 12,989.34
  4. Step 4: Simplify right side
    21,938.76x = 393,337,738.36
  5. Step 5: Solve for x
    x = 393,337,738.36/21,938.76
  6. Step 6: Final answer
    x = 17,928.90

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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.