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Finding the Fourth Proportional to 136,720.51, 188,646.12 and 78,566.00

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Solution

The fourth proportional to 136,720.51, 188,646.12 and 78,566.00 is: 108,404.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,720.51 : 188,646.12 = 78,566.00 : x
  2. Step 2: Convert to fraction form
    136,720.51/188,646.12 = 78,566.00/x
  3. Step 3: Cross multiply
    136,720.51x = 188,646.12 × 78,566.00
  4. Step 4: Simplify right side
    136,720.51x = 14,821,170,120.69
  5. Step 5: Solve for x
    x = 14,821,170,120.69/136,720.51
  6. Step 6: Final answer
    x = 108,404.88

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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.