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Finding the Fourth Proportional to 71,980.30, 100,641.20 and 71,980.30

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Solution

The fourth proportional to 71,980.30, 100,641.20 and 71,980.30 is: 100,641.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,980.30 : 100,641.20 = 71,980.30 : x
  2. Step 2: Convert to fraction form
    71,980.30/100,641.20 = 71,980.30/x
  3. Step 3: Cross multiply
    71,980.30x = 100,641.20 × 71,980.30
  4. Step 4: Simplify right side
    71,980.30x = 7,244,183,768.36
  5. Step 5: Solve for x
    x = 7,244,183,768.36/71,980.30
  6. Step 6: Final answer
    x = 100,641.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.