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Finding the Fourth Proportional to 13,310.69, 18,369.65 and 7,721.69

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Solution

The fourth proportional to 13,310.69, 18,369.65 and 7,721.69 is: 10,656.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,310.69 : 18,369.65 = 7,721.69 : x
  2. Step 2: Convert to fraction form
    13,310.69/18,369.65 = 7,721.69/x
  3. Step 3: Cross multiply
    13,310.69x = 18,369.65 × 7,721.69
  4. Step 4: Simplify right side
    13,310.69x = 141,844,670.16
  5. Step 5: Solve for x
    x = 141,844,670.16/13,310.69
  6. Step 6: Final answer
    x = 10,656.45

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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.