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Finding the Fourth Proportional to 139,302.40, 208,985.12 and 45,808.96

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Solution

The fourth proportional to 139,302.40, 208,985.12 and 45,808.96 is: 68,723.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,302.40 : 208,985.12 = 45,808.96 : x
  2. Step 2: Convert to fraction form
    139,302.40/208,985.12 = 45,808.96/x
  3. Step 3: Cross multiply
    139,302.40x = 208,985.12 × 45,808.96
  4. Step 4: Simplify right side
    139,302.40x = 9,573,391,002.68
  5. Step 5: Solve for x
    x = 9,573,391,002.68/139,302.40
  6. Step 6: Final answer
    x = 68,723.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.