Home / 81,438.82-122,128.22-28,117.24

Finding the Fourth Proportional to 81,438.82, 122,128.22 and 28,117.24

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Solution

The fourth proportional to 81,438.82, 122,128.22 and 28,117.24 is: 42,165.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,438.82 : 122,128.22 = 28,117.24 : x
  2. Step 2: Convert to fraction form
    81,438.82/122,128.22 = 28,117.24/x
  3. Step 3: Cross multiply
    81,438.82x = 122,128.22 × 28,117.24
  4. Step 4: Simplify right side
    81,438.82x = 3,433,908,472.51
  5. Step 5: Solve for x
    x = 3,433,908,472.51/81,438.82
  6. Step 6: Final answer
    x = 42,165.50

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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.