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Finding the Fourth Proportional to 15,679.69, 21,648.11 and 9,717.69

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Solution

The fourth proportional to 15,679.69, 21,648.11 and 9,717.69 is: 13,416.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,679.69 : 21,648.11 = 9,717.69 : x
  2. Step 2: Convert to fraction form
    15,679.69/21,648.11 = 9,717.69/x
  3. Step 3: Cross multiply
    15,679.69x = 21,648.11 × 9,717.69
  4. Step 4: Simplify right side
    15,679.69x = 210,369,622.07
  5. Step 5: Solve for x
    x = 210,369,622.07/15,679.69
  6. Step 6: Final answer
    x = 13,416.70

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Half scale
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Double scale
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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.