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Finding the Fourth Proportional to 71,645.91, 98,874.72 and 39,815.07

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Solution

The fourth proportional to 71,645.91, 98,874.72 and 39,815.07 is: 54,946.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,645.91 : 98,874.72 = 39,815.07 : x
  2. Step 2: Convert to fraction form
    71,645.91/98,874.72 = 39,815.07/x
  3. Step 3: Cross multiply
    71,645.91x = 98,874.72 × 39,815.07
  4. Step 4: Simplify right side
    71,645.91x = 3,936,703,898.03
  5. Step 5: Solve for x
    x = 3,936,703,898.03/71,645.91
  6. Step 6: Final answer
    x = 54,946.67

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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.