Home / 81,438.69-122,128.07-28,117.12

Finding the Fourth Proportional to 81,438.69, 122,128.07 and 28,117.12

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Solution

The fourth proportional to 81,438.69, 122,128.07 and 28,117.12 is: 42,165.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,438.69 : 122,128.07 = 28,117.12 : x
  2. Step 2: Convert to fraction form
    81,438.69/122,128.07 = 28,117.12/x
  3. Step 3: Cross multiply
    81,438.69x = 122,128.07 × 28,117.12
  4. Step 4: Simplify right side
    81,438.69x = 3,433,889,599.56
  5. Step 5: Solve for x
    x = 3,433,889,599.56/81,438.69
  6. Step 6: Final answer
    x = 42,165.34

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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.