Home / 21,740.81-30,002.43-12,311.21

Finding the Fourth Proportional to 21,740.81, 30,002.43 and 12,311.21

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Solution

The fourth proportional to 21,740.81, 30,002.43 and 12,311.21 is: 16,989.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,740.81 : 30,002.43 = 12,311.21 : x
  2. Step 2: Convert to fraction form
    21,740.81/30,002.43 = 12,311.21/x
  3. Step 3: Cross multiply
    21,740.81x = 30,002.43 × 12,311.21
  4. Step 4: Simplify right side
    21,740.81x = 369,366,216.24
  5. Step 5: Solve for x
    x = 369,366,216.24/21,740.81
  6. Step 6: Final answer
    x = 16,989.53

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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.