Home / 78,428.90-117,591.35-28,503.07

Finding the Fourth Proportional to 78,428.90, 117,591.35 and 28,503.07

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Solution

The fourth proportional to 78,428.90, 117,591.35 and 28,503.07 is: 42,735.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,428.90 : 117,591.35 = 28,503.07 : x
  2. Step 2: Convert to fraction form
    78,428.90/117,591.35 = 28,503.07/x
  3. Step 3: Cross multiply
    78,428.90x = 117,591.35 × 28,503.07
  4. Step 4: Simplify right side
    78,428.90x = 3,351,714,043.95
  5. Step 5: Solve for x
    x = 3,351,714,043.95/78,428.90
  6. Step 6: Final answer
    x = 42,735.70

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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.