Home / 247-340.98-155

Finding the Fourth Proportional to 247, 340.98 and 155

Calculator

Solution

The fourth proportional to 247, 340.98 and 155 is: 213.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    247 : 340.98 = 155 : x
  2. Step 2: Convert to fraction form
    247/340.98 = 155/x
  3. Step 3: Cross multiply
    247x = 340.98 × 155
  4. Step 4: Simplify right side
    247x = 52,851.90
  5. Step 5: Solve for x
    x = 52,851.90/247
  6. Step 6: Final answer
    x = 213.98

Related Problems

Find fourth proportional to 123.50, 170.49 and 77.50
Half scale
Find fourth proportional to 494, 681.96 and 310
Double scale
Find fourth proportional to 248, 342.36 and 156
Similar ratio
Find fourth proportional to 370.50, 511.47 and 232.50
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.