Home / 1,010.31-1,515.50-279.89

Finding the Fourth Proportional to 1,010.31, 1,515.50 and 279.89

Calculator

Solution

The fourth proportional to 1,010.31, 1,515.50 and 279.89 is: 419.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.31 : 1,515.50 = 279.89 : x
  2. Step 2: Convert to fraction form
    1,010.31/1,515.50 = 279.89/x
  3. Step 3: Cross multiply
    1,010.31x = 1,515.50 × 279.89
  4. Step 4: Simplify right side
    1,010.31x = 424,164.32
  5. Step 5: Solve for x
    x = 424,164.32/1,010.31
  6. Step 6: Final answer
    x = 419.84

Related Problems

Find fourth proportional to 505.16, 757.75 and 139.94
Half scale
Find fourth proportional to 2,020.62, 3,030.99 and 559.77
Double scale
Find fourth proportional to 1,011.31, 1,517 and 280.89
Similar ratio
Find fourth proportional to 1,515.47, 2,273.24 and 419.83
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.