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Finding the Fourth Proportional to 15,858.72, 21,881.88 and 9,571.44

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Solution

The fourth proportional to 15,858.72, 21,881.88 and 9,571.44 is: 13,206.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.72 : 21,881.88 = 9,571.44 : x
  2. Step 2: Convert to fraction form
    15,858.72/21,881.88 = 9,571.44/x
  3. Step 3: Cross multiply
    15,858.72x = 21,881.88 × 9,571.44
  4. Step 4: Simplify right side
    15,858.72x = 209,441,101.51
  5. Step 5: Solve for x
    x = 209,441,101.51/15,858.72
  6. Step 6: Final answer
    x = 13,206.68

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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.