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Finding the Fourth Proportional to 78,603.60, 117,905.40 and 58,645.20

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Solution

The fourth proportional to 78,603.60, 117,905.40 and 58,645.20 is: 87,967.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,603.60 : 117,905.40 = 58,645.20 : x
  2. Step 2: Convert to fraction form
    78,603.60/117,905.40 = 58,645.20/x
  3. Step 3: Cross multiply
    78,603.60x = 117,905.40 × 58,645.20
  4. Step 4: Simplify right side
    78,603.60x = 6,914,585,764.08
  5. Step 5: Solve for x
    x = 6,914,585,764.08/78,603.60
  6. Step 6: Final answer
    x = 87,967.80

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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.