Home / 353.40-489.69-347.64

Finding the Fourth Proportional to 353.40, 489.69 and 347.64

Calculator

Solution

The fourth proportional to 353.40, 489.69 and 347.64 is: 481.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.40 : 489.69 = 347.64 : x
  2. Step 2: Convert to fraction form
    353.40/489.69 = 347.64/x
  3. Step 3: Cross multiply
    353.40x = 489.69 × 347.64
  4. Step 4: Simplify right side
    353.40x = 170,235.83
  5. Step 5: Solve for x
    x = 170,235.83/353.40
  6. Step 6: Final answer
    x = 481.71

Related Problems

Find fourth proportional to 176.70, 244.85 and 173.82
Half scale
Find fourth proportional to 706.80, 979.38 and 695.28
Double scale
Find fourth proportional to 354.40, 491.08 and 348.64
Similar ratio
Find fourth proportional to 530.10, 734.54 and 521.46
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.