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Finding the Fourth Proportional to 72,702.40, 109,053.60 and 69,980.80

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Solution

The fourth proportional to 72,702.40, 109,053.60 and 69,980.80 is: 104,971.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,702.40 : 109,053.60 = 69,980.80 : x
  2. Step 2: Convert to fraction form
    72,702.40/109,053.60 = 69,980.80/x
  3. Step 3: Cross multiply
    72,702.40x = 109,053.60 × 69,980.80
  4. Step 4: Simplify right side
    72,702.40x = 7,631,658,170.88
  5. Step 5: Solve for x
    x = 7,631,658,170.88/72,702.40
  6. Step 6: Final answer
    x = 104,971.20

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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.