Home / 28,313.80-42,635.28-20,970.28

Finding the Fourth Proportional to 28,313.80, 42,635.28 and 20,970.28

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Solution

The fourth proportional to 28,313.80, 42,635.28 and 20,970.28 is: 31,577.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,313.80 : 42,635.28 = 20,970.28 : x
  2. Step 2: Convert to fraction form
    28,313.80/42,635.28 = 20,970.28/x
  3. Step 3: Cross multiply
    28,313.80x = 42,635.28 × 20,970.28
  4. Step 4: Simplify right side
    28,313.80x = 894,073,759.48
  5. Step 5: Solve for x
    x = 894,073,759.48/28,313.80
  6. Step 6: Final answer
    x = 31,577.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.