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Finding the Fourth Proportional to 28,005.87, 38,647.88 and 15,259.01

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Solution

The fourth proportional to 28,005.87, 38,647.88 and 15,259.01 is: 21,057.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,005.87 : 38,647.88 = 15,259.01 : x
  2. Step 2: Convert to fraction form
    28,005.87/38,647.88 = 15,259.01/x
  3. Step 3: Cross multiply
    28,005.87x = 38,647.88 × 15,259.01
  4. Step 4: Simplify right side
    28,005.87x = 589,728,425.55
  5. Step 5: Solve for x
    x = 589,728,425.55/28,005.87
  6. Step 6: Final answer
    x = 21,057.32

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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.