Home / 86,072.13-128,243.12-81,237.69

Finding the Fourth Proportional to 86,072.13, 128,243.12 and 81,237.69

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Solution

The fourth proportional to 86,072.13, 128,243.12 and 81,237.69 is: 121,040.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,072.13 : 128,243.12 = 81,237.69 : x
  2. Step 2: Convert to fraction form
    86,072.13/128,243.12 = 81,237.69/x
  3. Step 3: Cross multiply
    86,072.13x = 128,243.12 × 81,237.69
  4. Step 4: Simplify right side
    86,072.13x = 10,418,174,421.00
  5. Step 5: Solve for x
    x = 10,418,174,421.00/86,072.13
  6. Step 6: Final answer
    x = 121,040.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.