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Finding the Fourth Proportional to 15,368.12, 21,207.98 and 8,653.78

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Solution

The fourth proportional to 15,368.12, 21,207.98 and 8,653.78 is: 11,942.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,368.12 : 21,207.98 = 8,653.78 : x
  2. Step 2: Convert to fraction form
    15,368.12/21,207.98 = 8,653.78/x
  3. Step 3: Cross multiply
    15,368.12x = 21,207.98 × 8,653.78
  4. Step 4: Simplify right side
    15,368.12x = 183,529,043.86
  5. Step 5: Solve for x
    x = 183,529,043.86/15,368.12
  6. Step 6: Final answer
    x = 11,942.19

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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.