Home / 81,315.40-121,973.10-80,537.80

Finding the Fourth Proportional to 81,315.40, 121,973.10 and 80,537.80

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Solution

The fourth proportional to 81,315.40, 121,973.10 and 80,537.80 is: 120,806.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,315.40 : 121,973.10 = 80,537.80 : x
  2. Step 2: Convert to fraction form
    81,315.40/121,973.10 = 80,537.80/x
  3. Step 3: Cross multiply
    81,315.40x = 121,973.10 × 80,537.80
  4. Step 4: Simplify right side
    81,315.40x = 9,823,445,133.18
  5. Step 5: Solve for x
    x = 9,823,445,133.18/81,315.40
  6. Step 6: Final answer
    x = 120,806.70

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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.