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Finding the Fourth Proportional to 72,018, 99,384.48 and 40,185

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Solution

The fourth proportional to 72,018, 99,384.48 and 40,185 is: 55,455.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,018 : 99,384.48 = 40,185 : x
  2. Step 2: Convert to fraction form
    72,018/99,384.48 = 40,185/x
  3. Step 3: Cross multiply
    72,018x = 99,384.48 × 40,185
  4. Step 4: Simplify right side
    72,018x = 3,993,765,328.80
  5. Step 5: Solve for x
    x = 3,993,765,328.80/72,018
  6. Step 6: Final answer
    x = 55,455.10

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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.