Home / 81,411.40-121,971.30-72,080.20

Finding the Fourth Proportional to 81,411.40, 121,971.30 and 72,080.20

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Solution

The fourth proportional to 81,411.40, 121,971.30 and 72,080.20 is: 107,991.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,411.40 : 121,971.30 = 72,080.20 : x
  2. Step 2: Convert to fraction form
    81,411.40/121,971.30 = 72,080.20/x
  3. Step 3: Cross multiply
    81,411.40x = 121,971.30 × 72,080.20
  4. Step 4: Simplify right side
    81,411.40x = 8,791,715,698.26
  5. Step 5: Solve for x
    x = 8,791,715,698.26/81,411.40
  6. Step 6: Final answer
    x = 107,991.21

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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.