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Finding the Fourth Proportional to 65,881.92, 90,911.28 and 39,019.68

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Solution

The fourth proportional to 65,881.92, 90,911.28 and 39,019.68 is: 53,843.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,881.92 : 90,911.28 = 39,019.68 : x
  2. Step 2: Convert to fraction form
    65,881.92/90,911.28 = 39,019.68/x
  3. Step 3: Cross multiply
    65,881.92x = 90,911.28 × 39,019.68
  4. Step 4: Simplify right side
    65,881.92x = 3,547,329,053.99
  5. Step 5: Solve for x
    x = 3,547,329,053.99/65,881.92
  6. Step 6: Final answer
    x = 53,843.74

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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.