Home / 78,089.21-117,132.78-18,925.40

Finding the Fourth Proportional to 78,089.21, 117,132.78 and 18,925.40

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Solution

The fourth proportional to 78,089.21, 117,132.78 and 18,925.40 is: 28,387.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,089.21 : 117,132.78 = 18,925.40 : x
  2. Step 2: Convert to fraction form
    78,089.21/117,132.78 = 18,925.40/x
  3. Step 3: Cross multiply
    78,089.21x = 117,132.78 × 18,925.40
  4. Step 4: Simplify right side
    78,089.21x = 2,216,784,419.54
  5. Step 5: Solve for x
    x = 2,216,784,419.54/78,089.21
  6. Step 6: Final answer
    x = 28,387.84

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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.