Home / 420-579.68-236

Finding the Fourth Proportional to 420, 579.68 and 236

Calculator

Solution

The fourth proportional to 420, 579.68 and 236 is: 325.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    420 : 579.68 = 236 : x
  2. Step 2: Convert to fraction form
    420/579.68 = 236/x
  3. Step 3: Cross multiply
    420x = 579.68 × 236
  4. Step 4: Simplify right side
    420x = 136,804.48
  5. Step 5: Solve for x
    x = 136,804.48/420
  6. Step 6: Final answer
    x = 325.72

Related Problems

Find fourth proportional to 210, 289.84 and 118
Half scale
Find fourth proportional to 840, 1,159.36 and 472
Double scale
Find fourth proportional to 421, 581.06 and 237
Similar ratio
Find fourth proportional to 630, 869.52 and 354
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.