Home / 30,478.97-42,052.91-20,921.78

Finding the Fourth Proportional to 30,478.97, 42,052.91 and 20,921.78

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Solution

The fourth proportional to 30,478.97, 42,052.91 and 20,921.78 is: 28,866.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,478.97 : 42,052.91 = 20,921.78 : x
  2. Step 2: Convert to fraction form
    30,478.97/42,052.91 = 20,921.78/x
  3. Step 3: Cross multiply
    30,478.97x = 42,052.91 × 20,921.78
  4. Step 4: Simplify right side
    30,478.97x = 879,821,416.51
  5. Step 5: Solve for x
    x = 879,821,416.51/30,478.97
  6. Step 6: Final answer
    x = 28,866.51

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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.