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Finding the Fourth Proportional to 10,647.40, 15,971.10 and 7,165.80

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Solution

The fourth proportional to 10,647.40, 15,971.10 and 7,165.80 is: 10,748.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,647.40 : 15,971.10 = 7,165.80 : x
  2. Step 2: Convert to fraction form
    10,647.40/15,971.10 = 7,165.80/x
  3. Step 3: Cross multiply
    10,647.40x = 15,971.10 × 7,165.80
  4. Step 4: Simplify right side
    10,647.40x = 114,445,708.38
  5. Step 5: Solve for x
    x = 114,445,708.38/10,647.40
  6. Step 6: Final answer
    x = 10,748.70

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Similar ratio
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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.