Home / 30,638.14-42,300.23-20,443.75

Finding the Fourth Proportional to 30,638.14, 42,300.23 and 20,443.75

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Solution

The fourth proportional to 30,638.14, 42,300.23 and 20,443.75 is: 28,225.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,638.14 : 42,300.23 = 20,443.75 : x
  2. Step 2: Convert to fraction form
    30,638.14/42,300.23 = 20,443.75/x
  3. Step 3: Cross multiply
    30,638.14x = 42,300.23 × 20,443.75
  4. Step 4: Simplify right side
    30,638.14x = 864,775,119.09
  5. Step 5: Solve for x
    x = 864,775,119.09/30,638.14
  6. Step 6: Final answer
    x = 28,225.45

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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.