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Finding the Fourth Proportional to 78,759.68, 108,728.52 and 53,400.08

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Solution

The fourth proportional to 78,759.68, 108,728.52 and 53,400.08 is: 73,719.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,759.68 : 108,728.52 = 53,400.08 : x
  2. Step 2: Convert to fraction form
    78,759.68/108,728.52 = 53,400.08/x
  3. Step 3: Cross multiply
    78,759.68x = 108,728.52 × 53,400.08
  4. Step 4: Simplify right side
    78,759.68x = 5,806,111,666.28
  5. Step 5: Solve for x
    x = 5,806,111,666.28/78,759.68
  6. Step 6: Final answer
    x = 73,719.34

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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.