Home / 353.50-487.55-279.69

Finding the Fourth Proportional to 353.50, 487.55 and 279.69

Calculator

Solution

The fourth proportional to 353.50, 487.55 and 279.69 is: 385.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.50 : 487.55 = 279.69 : x
  2. Step 2: Convert to fraction form
    353.50/487.55 = 279.69/x
  3. Step 3: Cross multiply
    353.50x = 487.55 × 279.69
  4. Step 4: Simplify right side
    353.50x = 136,361.73
  5. Step 5: Solve for x
    x = 136,361.73/353.50
  6. Step 6: Final answer
    x = 385.75

Related Problems

Find fourth proportional to 176.75, 243.78 and 139.84
Half scale
Find fourth proportional to 707.00, 975.11 and 559.37
Double scale
Find fourth proportional to 354.50, 488.93 and 280.69
Similar ratio
Find fourth proportional to 530.25, 731.33 and 419.53
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.