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Finding the Fourth Proportional to 78,373.65, 108,172.86 and 51,518.64

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Solution

The fourth proportional to 78,373.65, 108,172.86 and 51,518.64 is: 71,107.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,373.65 : 108,172.86 = 51,518.64 : x
  2. Step 2: Convert to fraction form
    78,373.65/108,172.86 = 51,518.64/x
  3. Step 3: Cross multiply
    78,373.65x = 108,172.86 × 51,518.64
  4. Step 4: Simplify right side
    78,373.65x = 5,572,918,632.11
  5. Step 5: Solve for x
    x = 5,572,918,632.11/78,373.65
  6. Step 6: Final answer
    x = 71,107.04

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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.