Home / 78,749.70-118,148.40-28,142.10

Finding the Fourth Proportional to 78,749.70, 118,148.40 and 28,142.10

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Solution

The fourth proportional to 78,749.70, 118,148.40 and 28,142.10 is: 42,221.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,749.70 : 118,148.40 = 28,142.10 : x
  2. Step 2: Convert to fraction form
    78,749.70/118,148.40 = 28,142.10/x
  3. Step 3: Cross multiply
    78,749.70x = 118,148.40 × 28,142.10
  4. Step 4: Simplify right side
    78,749.70x = 3,324,944,087.64
  5. Step 5: Solve for x
    x = 3,324,944,087.64/78,749.70
  6. Step 6: Final answer
    x = 42,221.67

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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.