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Finding the Fourth Proportional to 15,691.94, 21,655.02 and 8,618.52

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Solution

The fourth proportional to 15,691.94, 21,655.02 and 8,618.52 is: 11,893.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.94 : 21,655.02 = 8,618.52 : x
  2. Step 2: Convert to fraction form
    15,691.94/21,655.02 = 8,618.52/x
  3. Step 3: Cross multiply
    15,691.94x = 21,655.02 × 8,618.52
  4. Step 4: Simplify right side
    15,691.94x = 186,634,222.97
  5. Step 5: Solve for x
    x = 186,634,222.97/15,691.94
  6. Step 6: Final answer
    x = 11,893.64

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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.