Home / 81,020.72-121,543.23-28,420.94

Finding the Fourth Proportional to 81,020.72, 121,543.23 and 28,420.94

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Solution

The fourth proportional to 81,020.72, 121,543.23 and 28,420.94 is: 42,635.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.72 : 121,543.23 = 28,420.94 : x
  2. Step 2: Convert to fraction form
    81,020.72/121,543.23 = 28,420.94/x
  3. Step 3: Cross multiply
    81,020.72x = 121,543.23 × 28,420.94
  4. Step 4: Simplify right side
    81,020.72x = 3,454,372,239.52
  5. Step 5: Solve for x
    x = 3,454,372,239.52/81,020.72
  6. Step 6: Final answer
    x = 42,635.67

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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.