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Finding the Fourth Proportional to 659,019.72, 909,418.35 and 387,115.50

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Solution

The fourth proportional to 659,019.72, 909,418.35 and 387,115.50 is: 534,202.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,019.72 : 909,418.35 = 387,115.50 : x
  2. Step 2: Convert to fraction form
    659,019.72/909,418.35 = 387,115.50/x
  3. Step 3: Cross multiply
    659,019.72x = 909,418.35 × 387,115.50
  4. Step 4: Simplify right side
    659,019.72x = 352,049,939,269.43
  5. Step 5: Solve for x
    x = 352,049,939,269.43/659,019.72
  6. Step 6: Final answer
    x = 534,202.44

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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.