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Finding the Fourth Proportional to 15,856.92, 21,881.58 and 8,782.92

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Solution

The fourth proportional to 15,856.92, 21,881.58 and 8,782.92 is: 12,119.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.92 : 21,881.58 = 8,782.92 : x
  2. Step 2: Convert to fraction form
    15,856.92/21,881.58 = 8,782.92/x
  3. Step 3: Cross multiply
    15,856.92x = 21,881.58 × 8,782.92
  4. Step 4: Simplify right side
    15,856.92x = 192,184,166.61
  5. Step 5: Solve for x
    x = 192,184,166.61/15,856.92
  6. Step 6: Final answer
    x = 12,119.89

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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.