Home / 658-987.12-316

Finding the Fourth Proportional to 658, 987.12 and 316

Calculator

Solution

The fourth proportional to 658, 987.12 and 316 is: 474.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    658 : 987.12 = 316 : x
  2. Step 2: Convert to fraction form
    658/987.12 = 316/x
  3. Step 3: Cross multiply
    658x = 987.12 × 316
  4. Step 4: Simplify right side
    658x = 311,929.92
  5. Step 5: Solve for x
    x = 311,929.92/658
  6. Step 6: Final answer
    x = 474.06

Related Problems

Find fourth proportional to 329, 493.56 and 158
Half scale
Find fourth proportional to 1,316, 1,974.24 and 632
Double scale
Find fourth proportional to 659, 988.62 and 317
Similar ratio
Find fourth proportional to 987, 1,480.68 and 474
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.