Home / 874.80-1,207-543.20

Finding the Fourth Proportional to 874.80, 1,207 and 543.20

Calculator

Solution

The fourth proportional to 874.80, 1,207 and 543.20 is: 749.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.80 : 1,207 = 543.20 : x
  2. Step 2: Convert to fraction form
    874.80/1,207 = 543.20/x
  3. Step 3: Cross multiply
    874.80x = 1,207 × 543.20
  4. Step 4: Simplify right side
    874.80x = 655,642.40
  5. Step 5: Solve for x
    x = 655,642.40/874.80
  6. Step 6: Final answer
    x = 749.48

Related Problems

Find fourth proportional to 437.40, 603.50 and 271.60
Half scale
Find fourth proportional to 1,749.60, 2,414 and 1,086.40
Double scale
Find fourth proportional to 875.80, 1,208.38 and 544.20
Similar ratio
Find fourth proportional to 1,312.20, 1,810.50 and 814.80
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.