Home / 28,315.14-42,380.30-20,816.72

Finding the Fourth Proportional to 28,315.14, 42,380.30 and 20,816.72

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Solution

The fourth proportional to 28,315.14, 42,380.30 and 20,816.72 is: 31,157.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,315.14 : 42,380.30 = 20,816.72 : x
  2. Step 2: Convert to fraction form
    28,315.14/42,380.30 = 20,816.72/x
  3. Step 3: Cross multiply
    28,315.14x = 42,380.30 × 20,816.72
  4. Step 4: Simplify right side
    28,315.14x = 882,218,522.63
  5. Step 5: Solve for x
    x = 882,218,522.63/28,315.14
  6. Step 6: Final answer
    x = 31,157.13

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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.