Home / 659.08-988.70-317

Finding the Fourth Proportional to 659.08, 988.70 and 317

Calculator

Solution

The fourth proportional to 659.08, 988.70 and 317 is: 475.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.08 : 988.70 = 317 : x
  2. Step 2: Convert to fraction form
    659.08/988.70 = 317/x
  3. Step 3: Cross multiply
    659.08x = 988.70 × 317
  4. Step 4: Simplify right side
    659.08x = 313,417.90
  5. Step 5: Solve for x
    x = 313,417.90/659.08
  6. Step 6: Final answer
    x = 475.54

Related Problems

Find fourth proportional to 329.54, 494.35 and 158.50
Half scale
Find fourth proportional to 1,318.16, 1,977.40 and 634
Double scale
Find fourth proportional to 660.08, 990.20 and 318
Similar ratio
Find fourth proportional to 988.62, 1,483.05 and 475.50
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.