Home / 1,200.30-1,800.90-470.39

Finding the Fourth Proportional to 1,200.30, 1,800.90 and 470.39

Calculator

Solution

The fourth proportional to 1,200.30, 1,800.90 and 470.39 is: 705.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.30 : 1,800.90 = 470.39 : x
  2. Step 2: Convert to fraction form
    1,200.30/1,800.90 = 470.39/x
  3. Step 3: Cross multiply
    1,200.30x = 1,800.90 × 470.39
  4. Step 4: Simplify right side
    1,200.30x = 847,116.35
  5. Step 5: Solve for x
    x = 847,116.35/1,200.30
  6. Step 6: Final answer
    x = 705.75

Related Problems

Find fourth proportional to 600.15, 900.45 and 235.19
Half scale
Find fourth proportional to 2,400.60, 3,601.80 and 940.77
Double scale
Find fourth proportional to 1,201.30, 1,802.40 and 471.39
Similar ratio
Find fourth proportional to 1,800.45, 2,701.35 and 705.58
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.