Home / 1,858-2,787-490

Finding the Fourth Proportional to 1,858, 2,787 and 490

Calculator

Solution

The fourth proportional to 1,858, 2,787 and 490 is: 735

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858 : 2,787 = 490 : x
  2. Step 2: Convert to fraction form
    1,858/2,787 = 490/x
  3. Step 3: Cross multiply
    1,858x = 2,787 × 490
  4. Step 4: Simplify right side
    1,858x = 1,365,630
  5. Step 5: Solve for x
    x = 1,365,630/1,858
  6. Step 6: Final answer
    x = 735

Related Problems

Find fourth proportional to 929, 1,393.50 and 245
Half scale
Find fourth proportional to 3,716, 5,574 and 980
Double scale
Find fourth proportional to 1,859, 2,788.50 and 491
Similar ratio
Find fourth proportional to 2,787, 4,180.50 and 735
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.