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Finding the Fourth Proportional to 260,087.10, 390,130.65 and 126,987.90

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Solution

The fourth proportional to 260,087.10, 390,130.65 and 126,987.90 is: 190,481.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,087.10 : 390,130.65 = 126,987.90 : x
  2. Step 2: Convert to fraction form
    260,087.10/390,130.65 = 126,987.90/x
  3. Step 3: Cross multiply
    260,087.10x = 390,130.65 × 126,987.90
  4. Step 4: Simplify right side
    260,087.10x = 49,541,871,969.14
  5. Step 5: Solve for x
    x = 49,541,871,969.14/260,087.10
  6. Step 6: Final answer
    x = 190,481.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.