Home / 566.80-781.24-391.76

Finding the Fourth Proportional to 566.80, 781.24 and 391.76

Calculator

Solution

The fourth proportional to 566.80, 781.24 and 391.76 is: 539.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    566.80 : 781.24 = 391.76 : x
  2. Step 2: Convert to fraction form
    566.80/781.24 = 391.76/x
  3. Step 3: Cross multiply
    566.80x = 781.24 × 391.76
  4. Step 4: Simplify right side
    566.80x = 306,058.58
  5. Step 5: Solve for x
    x = 306,058.58/566.80
  6. Step 6: Final answer
    x = 539.98

Related Problems

Find fourth proportional to 283.40, 390.62 and 195.88
Half scale
Find fourth proportional to 1,133.60, 1,562.48 and 783.52
Double scale
Find fourth proportional to 567.80, 782.62 and 392.76
Similar ratio
Find fourth proportional to 850.20, 1,171.86 and 587.64
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.