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Finding the Fourth Proportional to 124,486.90, 186,507.60 and 75,711.40

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Solution

The fourth proportional to 124,486.90, 186,507.60 and 75,711.40 is: 113,431.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,486.90 : 186,507.60 = 75,711.40 : x
  2. Step 2: Convert to fraction form
    124,486.90/186,507.60 = 75,711.40/x
  3. Step 3: Cross multiply
    124,486.90x = 186,507.60 × 75,711.40
  4. Step 4: Simplify right side
    124,486.90x = 14,120,751,506.64
  5. Step 5: Solve for x
    x = 14,120,751,506.64/124,486.90
  6. Step 6: Final answer
    x = 113,431.63

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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.