Home / 78,905.90-118,288.38-28,974.40

Finding the Fourth Proportional to 78,905.90, 118,288.38 and 28,974.40

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Solution

The fourth proportional to 78,905.90, 118,288.38 and 28,974.40 is: 43,435.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,905.90 : 118,288.38 = 28,974.40 : x
  2. Step 2: Convert to fraction form
    78,905.90/118,288.38 = 28,974.40/x
  3. Step 3: Cross multiply
    78,905.90x = 118,288.38 × 28,974.40
  4. Step 4: Simplify right side
    78,905.90x = 3,427,334,246.03
  5. Step 5: Solve for x
    x = 3,427,334,246.03/78,905.90
  6. Step 6: Final answer
    x = 43,435.72

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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.