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Finding the Fourth Proportional to 15,856.47, 21,881.34 and 8,783.01

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Solution

The fourth proportional to 15,856.47, 21,881.34 and 8,783.01 is: 12,120.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.47 : 21,881.34 = 8,783.01 : x
  2. Step 2: Convert to fraction form
    15,856.47/21,881.34 = 8,783.01/x
  3. Step 3: Cross multiply
    15,856.47x = 21,881.34 × 8,783.01
  4. Step 4: Simplify right side
    15,856.47x = 192,184,028.03
  5. Step 5: Solve for x
    x = 192,184,028.03/15,856.47
  6. Step 6: Final answer
    x = 12,120.23

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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.