Home / 915-1,372.50-265.79

Finding the Fourth Proportional to 915, 1,372.50 and 265.79

Calculator

Solution

The fourth proportional to 915, 1,372.50 and 265.79 is: 398.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    915 : 1,372.50 = 265.79 : x
  2. Step 2: Convert to fraction form
    915/1,372.50 = 265.79/x
  3. Step 3: Cross multiply
    915x = 1,372.50 × 265.79
  4. Step 4: Simplify right side
    915x = 364,789.91
  5. Step 5: Solve for x
    x = 364,789.91/915
  6. Step 6: Final answer
    x = 398.68

Related Problems

Find fourth proportional to 457.50, 686.25 and 132.89
Half scale
Find fourth proportional to 1,830, 2,745 and 531.57
Double scale
Find fourth proportional to 916, 1,374 and 266.79
Similar ratio
Find fourth proportional to 1,372.50, 2,058.75 and 398.68
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.