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Finding the Fourth Proportional to 15,376.60, 21,221 and 8,663.55

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Solution

The fourth proportional to 15,376.60, 21,221 and 8,663.55 is: 11,956.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,376.60 : 21,221 = 8,663.55 : x
  2. Step 2: Convert to fraction form
    15,376.60/21,221 = 8,663.55/x
  3. Step 3: Cross multiply
    15,376.60x = 21,221 × 8,663.55
  4. Step 4: Simplify right side
    15,376.60x = 183,849,194.55
  5. Step 5: Solve for x
    x = 183,849,194.55/15,376.60
  6. Step 6: Final answer
    x = 11,956.43

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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.