Home / 476.30-657.14-279.70

Finding the Fourth Proportional to 476.30, 657.14 and 279.70

Calculator

Solution

The fourth proportional to 476.30, 657.14 and 279.70 is: 385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.30 : 657.14 = 279.70 : x
  2. Step 2: Convert to fraction form
    476.30/657.14 = 279.70/x
  3. Step 3: Cross multiply
    476.30x = 657.14 × 279.70
  4. Step 4: Simplify right side
    476.30x = 183,802.06
  5. Step 5: Solve for x
    x = 183,802.06/476.30
  6. Step 6: Final answer
    x = 385.90

Related Problems

Find fourth proportional to 238.15, 328.57 and 139.85
Half scale
Find fourth proportional to 952.60, 1,314.28 and 559.40
Double scale
Find fourth proportional to 477.30, 658.52 and 280.70
Similar ratio
Find fourth proportional to 714.45, 985.71 and 419.55
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.