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Finding the Fourth Proportional to 71,813.64, 99,100.50 and 39,981.48

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Solution

The fourth proportional to 71,813.64, 99,100.50 and 39,981.48 is: 55,173.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,813.64 : 99,100.50 = 39,981.48 : x
  2. Step 2: Convert to fraction form
    71,813.64/99,100.50 = 39,981.48/x
  3. Step 3: Cross multiply
    71,813.64x = 99,100.50 × 39,981.48
  4. Step 4: Simplify right side
    71,813.64x = 3,962,184,658.74
  5. Step 5: Solve for x
    x = 3,962,184,658.74/71,813.64
  6. Step 6: Final answer
    x = 55,173.15

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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.