Home / 649.76-974-284.72

Finding the Fourth Proportional to 649.76, 974 and 284.72

Calculator

Solution

The fourth proportional to 649.76, 974 and 284.72 is: 426.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.76 : 974 = 284.72 : x
  2. Step 2: Convert to fraction form
    649.76/974 = 284.72/x
  3. Step 3: Cross multiply
    649.76x = 974 × 284.72
  4. Step 4: Simplify right side
    649.76x = 277,317.28
  5. Step 5: Solve for x
    x = 277,317.28/649.76
  6. Step 6: Final answer
    x = 426.80

Related Problems

Find fourth proportional to 324.88, 487 and 142.36
Half scale
Find fourth proportional to 1,299.52, 1,948 and 569.44
Double scale
Find fourth proportional to 650.76, 975.50 and 285.72
Similar ratio
Find fourth proportional to 974.64, 1,461 and 427.08
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.