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Finding the Fourth Proportional to 72,138.94, 99,549.88 and 40,308.10

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Solution

The fourth proportional to 72,138.94, 99,549.88 and 40,308.10 is: 55,624.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,138.94 : 99,549.88 = 40,308.10 : x
  2. Step 2: Convert to fraction form
    72,138.94/99,549.88 = 40,308.10/x
  3. Step 3: Cross multiply
    72,138.94x = 99,549.88 × 40,308.10
  4. Step 4: Simplify right side
    72,138.94x = 4,012,666,168.38
  5. Step 5: Solve for x
    x = 4,012,666,168.38/72,138.94
  6. Step 6: Final answer
    x = 55,624.14

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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.