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Finding the Fourth Proportional to 18,807.51, 25,918.11 and 15,439.53

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Solution

The fourth proportional to 18,807.51, 25,918.11 and 15,439.53 is: 21,276.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,807.51 : 25,918.11 = 15,439.53 : x
  2. Step 2: Convert to fraction form
    18,807.51/25,918.11 = 15,439.53/x
  3. Step 3: Cross multiply
    18,807.51x = 25,918.11 × 15,439.53
  4. Step 4: Simplify right side
    18,807.51x = 400,163,436.89
  5. Step 5: Solve for x
    x = 400,163,436.89/18,807.51
  6. Step 6: Final answer
    x = 21,276.79

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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.