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Finding the Fourth Proportional to 319,320.22, 478,991.64 and 79,435.36

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Solution

The fourth proportional to 319,320.22, 478,991.64 and 79,435.36 is: 119,155.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,320.22 : 478,991.64 = 79,435.36 : x
  2. Step 2: Convert to fraction form
    319,320.22/478,991.64 = 79,435.36/x
  3. Step 3: Cross multiply
    319,320.22x = 478,991.64 × 79,435.36
  4. Step 4: Simplify right side
    319,320.22x = 38,048,873,360.39
  5. Step 5: Solve for x
    x = 38,048,873,360.39/319,320.22
  6. Step 6: Final answer
    x = 119,155.85

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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.