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Finding the Fourth Proportional to 139,864.47, 209,747.30 and 45,090.83

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Solution

The fourth proportional to 139,864.47, 209,747.30 and 45,090.83 is: 67,620.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,864.47 : 209,747.30 = 45,090.83 : x
  2. Step 2: Convert to fraction form
    139,864.47/209,747.30 = 45,090.83/x
  3. Step 3: Cross multiply
    139,864.47x = 209,747.30 × 45,090.83
  4. Step 4: Simplify right side
    139,864.47x = 9,457,678,573.07
  5. Step 5: Solve for x
    x = 9,457,678,573.07/139,864.47
  6. Step 6: Final answer
    x = 67,620.31

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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.