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Finding the Fourth Proportional to 71,465.85, 98,628.93 and 39,645

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Solution

The fourth proportional to 71,465.85, 98,628.93 and 39,645 is: 54,713.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,465.85 : 98,628.93 = 39,645 : x
  2. Step 2: Convert to fraction form
    71,465.85/98,628.93 = 39,645/x
  3. Step 3: Cross multiply
    71,465.85x = 98,628.93 × 39,645
  4. Step 4: Simplify right side
    71,465.85x = 3,910,143,929.85
  5. Step 5: Solve for x
    x = 3,910,143,929.85/71,465.85
  6. Step 6: Final answer
    x = 54,713.46

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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.