Home / 501.21-690.38-353.59

Finding the Fourth Proportional to 501.21, 690.38 and 353.59

Calculator

Solution

The fourth proportional to 501.21, 690.38 and 353.59 is: 487.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.21 : 690.38 = 353.59 : x
  2. Step 2: Convert to fraction form
    501.21/690.38 = 353.59/x
  3. Step 3: Cross multiply
    501.21x = 690.38 × 353.59
  4. Step 4: Simplify right side
    501.21x = 244,111.46
  5. Step 5: Solve for x
    x = 244,111.46/501.21
  6. Step 6: Final answer
    x = 487.04

Related Problems

Find fourth proportional to 250.61, 345.19 and 176.80
Half scale
Find fourth proportional to 1,002.42, 1,380.76 and 707.18
Double scale
Find fourth proportional to 502.21, 691.76 and 354.59
Similar ratio
Find fourth proportional to 751.82, 1,035.57 and 530.39
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.