Home / 516-712.16-391.84

Finding the Fourth Proportional to 516, 712.16 and 391.84

Calculator

Solution

The fourth proportional to 516, 712.16 and 391.84 is: 540.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    516 : 712.16 = 391.84 : x
  2. Step 2: Convert to fraction form
    516/712.16 = 391.84/x
  3. Step 3: Cross multiply
    516x = 712.16 × 391.84
  4. Step 4: Simplify right side
    516x = 279,052.77
  5. Step 5: Solve for x
    x = 279,052.77/516
  6. Step 6: Final answer
    x = 540.80

Related Problems

Find fourth proportional to 258, 356.08 and 195.92
Half scale
Find fourth proportional to 1,032, 1,424.32 and 783.68
Double scale
Find fourth proportional to 517, 713.54 and 392.84
Similar ratio
Find fourth proportional to 774, 1,068.24 and 587.76
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.