Home / 13,688.64-18,891.44-7,721.55

Finding the Fourth Proportional to 13,688.64, 18,891.44 and 7,721.55

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Solution

The fourth proportional to 13,688.64, 18,891.44 and 7,721.55 is: 10,656.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.64 : 18,891.44 = 7,721.55 : x
  2. Step 2: Convert to fraction form
    13,688.64/18,891.44 = 7,721.55/x
  3. Step 3: Cross multiply
    13,688.64x = 18,891.44 × 7,721.55
  4. Step 4: Simplify right side
    13,688.64x = 145,871,065.47
  5. Step 5: Solve for x
    x = 145,871,065.47/13,688.64
  6. Step 6: Final answer
    x = 10,656.36

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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.