Home / 1,670.50-2,505.51-438.00

Finding the Fourth Proportional to 1,670.50, 2,505.51 and 438.00

Calculator

Solution

The fourth proportional to 1,670.50, 2,505.51 and 438.00 is: 656.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.50 : 2,505.51 = 438.00 : x
  2. Step 2: Convert to fraction form
    1,670.50/2,505.51 = 438.00/x
  3. Step 3: Cross multiply
    1,670.50x = 2,505.51 × 438.00
  4. Step 4: Simplify right side
    1,670.50x = 1,097,403.98
  5. Step 5: Solve for x
    x = 1,097,403.98/1,670.50
  6. Step 6: Final answer
    x = 656.93

Related Problems

Find fourth proportional to 835.25, 1,252.76 and 219.00
Half scale
Find fourth proportional to 3,341.00, 5,011.02 and 875.99
Double scale
Find fourth proportional to 1,671.50, 2,507.01 and 439
Similar ratio
Find fourth proportional to 2,505.75, 3,758.27 and 656.99
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.