Home / 354.90-489.42-315.60

Finding the Fourth Proportional to 354.90, 489.42 and 315.60

Calculator

Solution

The fourth proportional to 354.90, 489.42 and 315.60 is: 435.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.90 : 489.42 = 315.60 : x
  2. Step 2: Convert to fraction form
    354.90/489.42 = 315.60/x
  3. Step 3: Cross multiply
    354.90x = 489.42 × 315.60
  4. Step 4: Simplify right side
    354.90x = 154,460.95
  5. Step 5: Solve for x
    x = 154,460.95/354.90
  6. Step 6: Final answer
    x = 435.22

Related Problems

Find fourth proportional to 177.45, 244.71 and 157.80
Half scale
Find fourth proportional to 709.80, 978.84 and 631.20
Double scale
Find fourth proportional to 355.90, 490.80 and 316.60
Similar ratio
Find fourth proportional to 532.35, 734.13 and 473.40
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.