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Finding the Fourth Proportional to 7,166.72, 9,890.04 and 3,980

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Solution

The fourth proportional to 7,166.72, 9,890.04 and 3,980 is: 5,492.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,166.72 : 9,890.04 = 3,980 : x
  2. Step 2: Convert to fraction form
    7,166.72/9,890.04 = 3,980/x
  3. Step 3: Cross multiply
    7,166.72x = 9,890.04 × 3,980
  4. Step 4: Simplify right side
    7,166.72x = 39,362,359.20
  5. Step 5: Solve for x
    x = 39,362,359.20/7,166.72
  6. Step 6: Final answer
    x = 5,492.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.