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Finding the Fourth Proportional to 78,840.30, 118,260.45 and 68,702.70

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Solution

The fourth proportional to 78,840.30, 118,260.45 and 68,702.70 is: 103,054.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,840.30 : 118,260.45 = 68,702.70 : x
  2. Step 2: Convert to fraction form
    78,840.30/118,260.45 = 68,702.70/x
  3. Step 3: Cross multiply
    78,840.30x = 118,260.45 × 68,702.70
  4. Step 4: Simplify right side
    78,840.30x = 8,124,812,218.22
  5. Step 5: Solve for x
    x = 8,124,812,218.22/78,840.30
  6. Step 6: Final answer
    x = 103,054.05

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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.