Home / 462.70-638.17-287.88

Finding the Fourth Proportional to 462.70, 638.17 and 287.88

Calculator

Solution

The fourth proportional to 462.70, 638.17 and 287.88 is: 397.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.70 : 638.17 = 287.88 : x
  2. Step 2: Convert to fraction form
    462.70/638.17 = 287.88/x
  3. Step 3: Cross multiply
    462.70x = 638.17 × 287.88
  4. Step 4: Simplify right side
    462.70x = 183,716.38
  5. Step 5: Solve for x
    x = 183,716.38/462.70
  6. Step 6: Final answer
    x = 397.05

Related Problems

Find fourth proportional to 231.35, 319.09 and 143.94
Half scale
Find fourth proportional to 925.40, 1,276.34 and 575.76
Double scale
Find fourth proportional to 463.70, 639.55 and 288.88
Similar ratio
Find fourth proportional to 694.05, 957.26 and 431.82
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.