Home / 617.40-851.81-355.41

Finding the Fourth Proportional to 617.40, 851.81 and 355.41

Calculator

Solution

The fourth proportional to 617.40, 851.81 and 355.41 is: 490.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.40 : 851.81 = 355.41 : x
  2. Step 2: Convert to fraction form
    617.40/851.81 = 355.41/x
  3. Step 3: Cross multiply
    617.40x = 851.81 × 355.41
  4. Step 4: Simplify right side
    617.40x = 302,740.02
  5. Step 5: Solve for x
    x = 302,740.02/617.40
  6. Step 6: Final answer
    x = 490.35

Related Problems

Find fourth proportional to 308.70, 425.90 and 177.71
Half scale
Find fourth proportional to 1,234.80, 1,703.61 and 710.82
Double scale
Find fourth proportional to 618.40, 853.18 and 356.41
Similar ratio
Find fourth proportional to 926.10, 1,277.71 and 533.12
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.