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Finding the Fourth Proportional to 65,981.88, 91,043.46 and 39,130.99

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Solution

The fourth proportional to 65,981.88, 91,043.46 and 39,130.99 is: 53,993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,981.88 : 91,043.46 = 39,130.99 : x
  2. Step 2: Convert to fraction form
    65,981.88/91,043.46 = 39,130.99/x
  3. Step 3: Cross multiply
    65,981.88x = 91,043.46 × 39,130.99
  4. Step 4: Simplify right side
    65,981.88x = 3,562,620,722.83
  5. Step 5: Solve for x
    x = 3,562,620,722.83/65,981.88
  6. Step 6: Final answer
    x = 53,993.93

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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.