Home / 874.08-1,310.85-387

Finding the Fourth Proportional to 874.08, 1,310.85 and 387

Calculator

Solution

The fourth proportional to 874.08, 1,310.85 and 387 is: 580.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.08 : 1,310.85 = 387 : x
  2. Step 2: Convert to fraction form
    874.08/1,310.85 = 387/x
  3. Step 3: Cross multiply
    874.08x = 1,310.85 × 387
  4. Step 4: Simplify right side
    874.08x = 507,298.95
  5. Step 5: Solve for x
    x = 507,298.95/874.08
  6. Step 6: Final answer
    x = 580.38

Related Problems

Find fourth proportional to 437.04, 655.43 and 193.50
Half scale
Find fourth proportional to 1,748.16, 2,621.70 and 774
Double scale
Find fourth proportional to 875.08, 1,312.35 and 388
Similar ratio
Find fourth proportional to 1,311.12, 1,966.28 and 580.50
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.