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Finding the Fourth Proportional to 665,178.81, 917,947.59 and 378,698.89

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Solution

The fourth proportional to 665,178.81, 917,947.59 and 378,698.89 is: 522,604.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,178.81 : 917,947.59 = 378,698.89 : x
  2. Step 2: Convert to fraction form
    665,178.81/917,947.59 = 378,698.89/x
  3. Step 3: Cross multiply
    665,178.81x = 917,947.59 × 378,698.89
  4. Step 4: Simplify right side
    665,178.81x = 347,625,733,411.18
  5. Step 5: Solve for x
    x = 347,625,733,411.18/665,178.81
  6. Step 6: Final answer
    x = 522,604.94

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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.