Home / 713.64-1,070.55-280.70

Finding the Fourth Proportional to 713.64, 1,070.55 and 280.70

Calculator

Solution

The fourth proportional to 713.64, 1,070.55 and 280.70 is: 421.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.64 : 1,070.55 = 280.70 : x
  2. Step 2: Convert to fraction form
    713.64/1,070.55 = 280.70/x
  3. Step 3: Cross multiply
    713.64x = 1,070.55 × 280.70
  4. Step 4: Simplify right side
    713.64x = 300,498.03
  5. Step 5: Solve for x
    x = 300,498.03/713.64
  6. Step 6: Final answer
    x = 421.08

Related Problems

Find fourth proportional to 356.82, 535.28 and 140.35
Half scale
Find fourth proportional to 1,427.28, 2,141.10 and 561.39
Double scale
Find fourth proportional to 714.64, 1,072.05 and 281.70
Similar ratio
Find fourth proportional to 1,070.46, 1,605.83 and 421.04
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.