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Finding the Fourth Proportional to 72,605.84, 100,185.21 and 40,768.58

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Solution

The fourth proportional to 72,605.84, 100,185.21 and 40,768.58 is: 56,254.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,605.84 : 100,185.21 = 40,768.58 : x
  2. Step 2: Convert to fraction form
    72,605.84/100,185.21 = 40,768.58/x
  3. Step 3: Cross multiply
    72,605.84x = 100,185.21 × 40,768.58
  4. Step 4: Simplify right side
    72,605.84x = 4,084,408,247.78
  5. Step 5: Solve for x
    x = 4,084,408,247.78/72,605.84
  6. Step 6: Final answer
    x = 56,254.55

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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.