Home / 965.60-1,447.84-388

Finding the Fourth Proportional to 965.60, 1,447.84 and 388

Calculator

Solution

The fourth proportional to 965.60, 1,447.84 and 388 is: 581.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.60 : 1,447.84 = 388 : x
  2. Step 2: Convert to fraction form
    965.60/1,447.84 = 388/x
  3. Step 3: Cross multiply
    965.60x = 1,447.84 × 388
  4. Step 4: Simplify right side
    965.60x = 561,761.92
  5. Step 5: Solve for x
    x = 561,761.92/965.60
  6. Step 6: Final answer
    x = 581.77

Related Problems

Find fourth proportional to 482.80, 723.92 and 194
Half scale
Find fourth proportional to 1,931.20, 2,895.68 and 776
Double scale
Find fourth proportional to 966.60, 1,449.34 and 389
Similar ratio
Find fourth proportional to 1,448.40, 2,171.76 and 582
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.