Home / 257,978-390,861

Finding the Third Proportional to 257,978 and 390,861

Calculator

Solution

The third proportional to 257,978 and 390,861 is: 592,191.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,978 : 390,861 = 390,861 : x
  2. Step 2: Convert to fraction form
    257,978/390,861 = 390,861/x
  3. Step 3: Cross multiply
    257,978x = 390,861 × 390,861
  4. Step 4: Simplify right side
    257,978x = 152,772,321,321
  5. Step 5: Solve for x
    x = 152,772,321,321/257,978
  6. Step 6: Final answer
    x = 592,191.28

Related Problems

Find third proportional to 128,989 and 195,430.50
Half scale
Find third proportional to 515,956 and 781,722
Double scale
Find third proportional to 257,980 and 390,864
Similar ratio
Find third proportional to 386,967 and 586,291.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.