Home / 498-688-420.24

Finding the Fourth Proportional to 498, 688 and 420.24

Calculator

Solution

The fourth proportional to 498, 688 and 420.24 is: 580.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    498 : 688 = 420.24 : x
  2. Step 2: Convert to fraction form
    498/688 = 420.24/x
  3. Step 3: Cross multiply
    498x = 688 × 420.24
  4. Step 4: Simplify right side
    498x = 289,125.12
  5. Step 5: Solve for x
    x = 289,125.12/498
  6. Step 6: Final answer
    x = 580.57

Related Problems

Find fourth proportional to 249, 344 and 210.12
Half scale
Find fourth proportional to 996, 1,376 and 840.48
Double scale
Find fourth proportional to 499, 689.38 and 421.24
Similar ratio
Find fourth proportional to 747, 1,032 and 630.36
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.