Home / 879.65-1,213.35-530

Finding the Fourth Proportional to 879.65, 1,213.35 and 530

Calculator

Solution

The fourth proportional to 879.65, 1,213.35 and 530 is: 731.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.65 : 1,213.35 = 530 : x
  2. Step 2: Convert to fraction form
    879.65/1,213.35 = 530/x
  3. Step 3: Cross multiply
    879.65x = 1,213.35 × 530
  4. Step 4: Simplify right side
    879.65x = 643,075.50
  5. Step 5: Solve for x
    x = 643,075.50/879.65
  6. Step 6: Final answer
    x = 731.06

Related Problems

Find fourth proportional to 439.83, 606.68 and 265
Half scale
Find fourth proportional to 1,759.30, 2,426.70 and 1,060
Double scale
Find fourth proportional to 880.65, 1,214.73 and 531
Similar ratio
Find fourth proportional to 1,319.48, 1,820.03 and 795
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.