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Finding the Fourth Proportional to 13,688.91, 18,891.91 and 7,721.74

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Solution

The fourth proportional to 13,688.91, 18,891.91 and 7,721.74 is: 10,656.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.91 : 18,891.91 = 7,721.74 : x
  2. Step 2: Convert to fraction form
    13,688.91/18,891.91 = 7,721.74/x
  3. Step 3: Cross multiply
    13,688.91x = 18,891.91 × 7,721.74
  4. Step 4: Simplify right side
    13,688.91x = 145,878,417.12
  5. Step 5: Solve for x
    x = 145,878,417.12/13,688.91
  6. Step 6: Final answer
    x = 10,656.69

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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.