Home / 81,039.69-111,700.92-54,172.40

Finding the Fourth Proportional to 81,039.69, 111,700.92 and 54,172.40

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Solution

The fourth proportional to 81,039.69, 111,700.92 and 54,172.40 is: 74,668.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,039.69 : 111,700.92 = 54,172.40 : x
  2. Step 2: Convert to fraction form
    81,039.69/111,700.92 = 54,172.40/x
  3. Step 3: Cross multiply
    81,039.69x = 111,700.92 × 54,172.40
  4. Step 4: Simplify right side
    81,039.69x = 6,051,106,639.36
  5. Step 5: Solve for x
    x = 6,051,106,639.36/81,039.69
  6. Step 6: Final answer
    x = 74,668.43

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1.5x scale

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.