Home / 86,670-130,005-21,006

Finding the Fourth Proportional to 86,670, 130,005 and 21,006

Calculator

Solution

The fourth proportional to 86,670, 130,005 and 21,006 is: 31,509

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,670 : 130,005 = 21,006 : x
  2. Step 2: Convert to fraction form
    86,670/130,005 = 21,006/x
  3. Step 3: Cross multiply
    86,670x = 130,005 × 21,006
  4. Step 4: Simplify right side
    86,670x = 2,730,885,030
  5. Step 5: Solve for x
    x = 2,730,885,030/86,670
  6. Step 6: Final answer
    x = 31,509

Related Problems

Find fourth proportional to 43,335, 65,002.50 and 10,503
Half scale
Find fourth proportional to 173,340, 260,010 and 42,012
Double scale
Find fourth proportional to 86,671, 130,006.50 and 21,007
Similar ratio
Find fourth proportional to 130,005, 195,007.50 and 31,509
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.