Home / 283.20-390.80-158.85

Finding the Fourth Proportional to 283.20, 390.80 and 158.85

Calculator

Solution

The fourth proportional to 283.20, 390.80 and 158.85 is: 219.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.20 : 390.80 = 158.85 : x
  2. Step 2: Convert to fraction form
    283.20/390.80 = 158.85/x
  3. Step 3: Cross multiply
    283.20x = 390.80 × 158.85
  4. Step 4: Simplify right side
    283.20x = 62,077.79
  5. Step 5: Solve for x
    x = 62,077.79/283.20
  6. Step 6: Final answer
    x = 219.20

Related Problems

Find fourth proportional to 141.60, 195.40 and 79.43
Half scale
Find fourth proportional to 566.40, 781.59 and 317.70
Double scale
Find fourth proportional to 284.20, 392.17 and 159.85
Similar ratio
Find fourth proportional to 424.80, 586.19 and 238.28
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.