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Finding the Fourth Proportional to 619,630.86, 855,368.15 and 378,009.74

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Solution

The fourth proportional to 619,630.86, 855,368.15 and 378,009.74 is: 521,822.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,630.86 : 855,368.15 = 378,009.74 : x
  2. Step 2: Convert to fraction form
    619,630.86/855,368.15 = 378,009.74/x
  3. Step 3: Cross multiply
    619,630.86x = 855,368.15 × 378,009.74
  4. Step 4: Simplify right side
    619,630.86x = 323,337,489,549.01
  5. Step 5: Solve for x
    x = 323,337,489,549.01/619,630.86
  6. Step 6: Final answer
    x = 521,822.76

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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.