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Finding the Fourth Proportional to 15,693.84, 21,656.70 and 8,979.12

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Solution

The fourth proportional to 15,693.84, 21,656.70 and 8,979.12 is: 12,390.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,693.84 : 21,656.70 = 8,979.12 : x
  2. Step 2: Convert to fraction form
    15,693.84/21,656.70 = 8,979.12/x
  3. Step 3: Cross multiply
    15,693.84x = 21,656.70 × 8,979.12
  4. Step 4: Simplify right side
    15,693.84x = 194,458,108.10
  5. Step 5: Solve for x
    x = 194,458,108.10/15,693.84
  6. Step 6: Final answer
    x = 12,390.73

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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.