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Finding the Fourth Proportional to 519,866.45, 717,421.20 and 305,010.11

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Solution

The fourth proportional to 519,866.45, 717,421.20 and 305,010.11 is: 420,917.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,866.45 : 717,421.20 = 305,010.11 : x
  2. Step 2: Convert to fraction form
    519,866.45/717,421.20 = 305,010.11/x
  3. Step 3: Cross multiply
    519,866.45x = 717,421.20 × 305,010.11
  4. Step 4: Simplify right side
    519,866.45x = 218,820,717,458.29
  5. Step 5: Solve for x
    x = 218,820,717,458.29/519,866.45
  6. Step 6: Final answer
    x = 420,917.17

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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.