Home / 847.74-1,272-415.20

Finding the Fourth Proportional to 847.74, 1,272 and 415.20

Calculator

Solution

The fourth proportional to 847.74, 1,272 and 415.20 is: 622.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.74 : 1,272 = 415.20 : x
  2. Step 2: Convert to fraction form
    847.74/1,272 = 415.20/x
  3. Step 3: Cross multiply
    847.74x = 1,272 × 415.20
  4. Step 4: Simplify right side
    847.74x = 528,134.40
  5. Step 5: Solve for x
    x = 528,134.40/847.74
  6. Step 6: Final answer
    x = 622.99

Related Problems

Find fourth proportional to 423.87, 636 and 207.60
Half scale
Find fourth proportional to 1,695.48, 2,544 and 830.40
Double scale
Find fourth proportional to 848.74, 1,273.50 and 416.20
Similar ratio
Find fourth proportional to 1,271.61, 1,908 and 622.80
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.