Home / 18,980-28,470-5,129

Finding the Fourth Proportional to 18,980, 28,470 and 5,129

Calculator

Solution

The fourth proportional to 18,980, 28,470 and 5,129 is: 7,693.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980 : 28,470 = 5,129 : x
  2. Step 2: Convert to fraction form
    18,980/28,470 = 5,129/x
  3. Step 3: Cross multiply
    18,980x = 28,470 × 5,129
  4. Step 4: Simplify right side
    18,980x = 146,022,630
  5. Step 5: Solve for x
    x = 146,022,630/18,980
  6. Step 6: Final answer
    x = 7,693.50

Related Problems

Find fourth proportional to 9,490, 14,235 and 2,564.50
Half scale
Find fourth proportional to 37,960, 56,940 and 10,258
Double scale
Find fourth proportional to 18,981, 28,471.50 and 5,130
Similar ratio
Find fourth proportional to 28,470, 42,705 and 7,693.50
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.