Home / 21,017.21-31,525.88-12,146.09

Finding the Fourth Proportional to 21,017.21, 31,525.88 and 12,146.09

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Solution

The fourth proportional to 21,017.21, 31,525.88 and 12,146.09 is: 18,219.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,017.21 : 31,525.88 = 12,146.09 : x
  2. Step 2: Convert to fraction form
    21,017.21/31,525.88 = 12,146.09/x
  3. Step 3: Cross multiply
    21,017.21x = 31,525.88 × 12,146.09
  4. Step 4: Simplify right side
    21,017.21x = 382,915,957.45
  5. Step 5: Solve for x
    x = 382,915,957.45/21,017.21
  6. Step 6: Final answer
    x = 18,219.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.