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Finding the Fourth Proportional to 15,159.66, 20,912.94 and 9,780.63

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Solution

The fourth proportional to 15,159.66, 20,912.94 and 9,780.63 is: 13,492.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.66 : 20,912.94 = 9,780.63 : x
  2. Step 2: Convert to fraction form
    15,159.66/20,912.94 = 9,780.63/x
  3. Step 3: Cross multiply
    15,159.66x = 20,912.94 × 9,780.63
  4. Step 4: Simplify right side
    15,159.66x = 204,541,728.35
  5. Step 5: Solve for x
    x = 204,541,728.35/15,159.66
  6. Step 6: Final answer
    x = 13,492.50

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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.