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Finding the Fourth Proportional to 81,130, 111,959.40 and 45,802

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Solution

The fourth proportional to 81,130, 111,959.40 and 45,802 is: 63,206.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,130 : 111,959.40 = 45,802 : x
  2. Step 2: Convert to fraction form
    81,130/111,959.40 = 45,802/x
  3. Step 3: Cross multiply
    81,130x = 111,959.40 × 45,802
  4. Step 4: Simplify right side
    81,130x = 5,127,964,438.80
  5. Step 5: Solve for x
    x = 5,127,964,438.80/81,130
  6. Step 6: Final answer
    x = 63,206.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.