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Finding the Fourth Proportional to 15,801.85, 21,807.06 and 8,728.39

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Solution

The fourth proportional to 15,801.85, 21,807.06 and 8,728.39 is: 12,045.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,801.85 : 21,807.06 = 8,728.39 : x
  2. Step 2: Convert to fraction form
    15,801.85/21,807.06 = 8,728.39/x
  3. Step 3: Cross multiply
    15,801.85x = 21,807.06 × 8,728.39
  4. Step 4: Simplify right side
    15,801.85x = 190,340,415.40
  5. Step 5: Solve for x
    x = 190,340,415.40/15,801.85
  6. Step 6: Final answer
    x = 12,045.46

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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.