Home / 21,828.45-30,127.20-12,875.42

Finding the Fourth Proportional to 21,828.45, 30,127.20 and 12,875.42

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Solution

The fourth proportional to 21,828.45, 30,127.20 and 12,875.42 is: 17,770.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,828.45 : 30,127.20 = 12,875.42 : x
  2. Step 2: Convert to fraction form
    21,828.45/30,127.20 = 12,875.42/x
  3. Step 3: Cross multiply
    21,828.45x = 30,127.20 × 12,875.42
  4. Step 4: Simplify right side
    21,828.45x = 387,900,202.79
  5. Step 5: Solve for x
    x = 387,900,202.79/21,828.45
  6. Step 6: Final answer
    x = 17,770.40

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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.