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Finding the Fourth Proportional to 72,186.88, 99,620.99 and 40,355.77

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Solution

The fourth proportional to 72,186.88, 99,620.99 and 40,355.77 is: 55,692.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,186.88 : 99,620.99 = 40,355.77 : x
  2. Step 2: Convert to fraction form
    72,186.88/99,620.99 = 40,355.77/x
  3. Step 3: Cross multiply
    72,186.88x = 99,620.99 × 40,355.77
  4. Step 4: Simplify right side
    72,186.88x = 4,020,281,759.61
  5. Step 5: Solve for x
    x = 4,020,281,759.61/72,186.88
  6. Step 6: Final answer
    x = 55,692.69

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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.