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Finding the Fourth Proportional to 78,564.58, 108,145.31 and 68,475.51

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Solution

The fourth proportional to 78,564.58, 108,145.31 and 68,475.51 is: 94,257.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,564.58 : 108,145.31 = 68,475.51 : x
  2. Step 2: Convert to fraction form
    78,564.58/108,145.31 = 68,475.51/x
  3. Step 3: Cross multiply
    78,564.58x = 108,145.31 × 68,475.51
  4. Step 4: Simplify right side
    78,564.58x = 7,405,304,913.98
  5. Step 5: Solve for x
    x = 7,405,304,913.98/78,564.58
  6. Step 6: Final answer
    x = 94,257.55

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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.