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Finding the Fourth Proportional to 15,861.41, 21,888.64 and 8,787.81

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Solution

The fourth proportional to 15,861.41, 21,888.64 and 8,787.81 is: 12,127.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.41 : 21,888.64 = 8,787.81 : x
  2. Step 2: Convert to fraction form
    15,861.41/21,888.64 = 8,787.81/x
  3. Step 3: Cross multiply
    15,861.41x = 21,888.64 × 8,787.81
  4. Step 4: Simplify right side
    15,861.41x = 192,353,187.51
  5. Step 5: Solve for x
    x = 192,353,187.51/15,861.41
  6. Step 6: Final answer
    x = 12,127.12

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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.