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Finding the Fourth Proportional to 72,706.40, 109,059.60 and 69,984.80

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Solution

The fourth proportional to 72,706.40, 109,059.60 and 69,984.80 is: 104,977.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,706.40 : 109,059.60 = 69,984.80 : x
  2. Step 2: Convert to fraction form
    72,706.40/109,059.60 = 69,984.80/x
  3. Step 3: Cross multiply
    72,706.40x = 109,059.60 × 69,984.80
  4. Step 4: Simplify right side
    72,706.40x = 7,632,514,294.08
  5. Step 5: Solve for x
    x = 7,632,514,294.08/72,706.40
  6. Step 6: Final answer
    x = 104,977.20

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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.