Home / 259,455.15-389,237.40-81,980.10

Finding the Fourth Proportional to 259,455.15, 389,237.40 and 81,980.10

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Solution

The fourth proportional to 259,455.15, 389,237.40 and 81,980.10 is: 122,987.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,455.15 : 389,237.40 = 81,980.10 : x
  2. Step 2: Convert to fraction form
    259,455.15/389,237.40 = 81,980.10/x
  3. Step 3: Cross multiply
    259,455.15x = 389,237.40 × 81,980.10
  4. Step 4: Simplify right side
    259,455.15x = 31,909,720,975.74
  5. Step 5: Solve for x
    x = 31,909,720,975.74/259,455.15
  6. Step 6: Final answer
    x = 122,987.43

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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.