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Finding the Fourth Proportional to 78,697.80, 118,046.70 and 57,702.60

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Solution

The fourth proportional to 78,697.80, 118,046.70 and 57,702.60 is: 86,553.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,697.80 : 118,046.70 = 57,702.60 : x
  2. Step 2: Convert to fraction form
    78,697.80/118,046.70 = 57,702.60/x
  3. Step 3: Cross multiply
    78,697.80x = 118,046.70 × 57,702.60
  4. Step 4: Simplify right side
    78,697.80x = 6,811,601,511.42
  5. Step 5: Solve for x
    x = 6,811,601,511.42/78,697.80
  6. Step 6: Final answer
    x = 86,553.90

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1.5x scale

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.