Home / 551-618

Finding the Third Proportional to 551 and 618

Calculator

Solution

The third proportional to 551 and 618 is: 693.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    551 : 618 = 618 : x
  2. Step 2: Convert to fraction form
    551/618 = 618/x
  3. Step 3: Cross multiply
    551x = 618 × 618
  4. Step 4: Simplify right side
    551x = 381,924
  5. Step 5: Solve for x
    x = 381,924/551
  6. Step 6: Final answer
    x = 693.15

Related Problems

Find third proportional to 275.50 and 309
Half scale
Find third proportional to 1,102 and 1,236
Double scale
Find third proportional to 553 and 620
Similar ratio
Find third proportional to 826.50 and 927
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.