Home / 688-1,031.50-255.16

Finding the Fourth Proportional to 688, 1,031.50 and 255.16

Calculator

Solution

The fourth proportional to 688, 1,031.50 and 255.16 is: 382.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 1,031.50 = 255.16 : x
  2. Step 2: Convert to fraction form
    688/1,031.50 = 255.16/x
  3. Step 3: Cross multiply
    688x = 1,031.50 × 255.16
  4. Step 4: Simplify right side
    688x = 263,197.54
  5. Step 5: Solve for x
    x = 263,197.54/688
  6. Step 6: Final answer
    x = 382.55

Related Problems

Find fourth proportional to 344, 515.75 and 127.58
Half scale
Find fourth proportional to 1,376, 2,063 and 510.32
Double scale
Find fourth proportional to 689, 1,033 and 256.16
Similar ratio
Find fourth proportional to 1,032, 1,547.25 and 382.74
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.