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Finding the Fourth Proportional to 14,143.70, 21,215.55 and 7,999.70

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Solution

The fourth proportional to 14,143.70, 21,215.55 and 7,999.70 is: 11,999.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,143.70 : 21,215.55 = 7,999.70 : x
  2. Step 2: Convert to fraction form
    14,143.70/21,215.55 = 7,999.70/x
  3. Step 3: Cross multiply
    14,143.70x = 21,215.55 × 7,999.70
  4. Step 4: Simplify right side
    14,143.70x = 169,718,035.34
  5. Step 5: Solve for x
    x = 169,718,035.34/14,143.70
  6. Step 6: Final answer
    x = 11,999.55

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Double scale
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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.