Home / 1,029.80-1,421-587.72

Finding the Fourth Proportional to 1,029.80, 1,421 and 587.72

Calculator

Solution

The fourth proportional to 1,029.80, 1,421 and 587.72 is: 810.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.80 : 1,421 = 587.72 : x
  2. Step 2: Convert to fraction form
    1,029.80/1,421 = 587.72/x
  3. Step 3: Cross multiply
    1,029.80x = 1,421 × 587.72
  4. Step 4: Simplify right side
    1,029.80x = 835,150.12
  5. Step 5: Solve for x
    x = 835,150.12/1,029.80
  6. Step 6: Final answer
    x = 810.98

Related Problems

Find fourth proportional to 514.90, 710.50 and 293.86
Half scale
Find fourth proportional to 2,059.60, 2,842 and 1,175.44
Double scale
Find fourth proportional to 1,030.80, 1,422.38 and 588.72
Similar ratio
Find fourth proportional to 1,544.70, 2,131.50 and 881.58
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.