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Finding the Fourth Proportional to 12,992.40, 19,490.40 and 4,670.87

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Solution

The fourth proportional to 12,992.40, 19,490.40 and 4,670.87 is: 7,006.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,992.40 : 19,490.40 = 4,670.87 : x
  2. Step 2: Convert to fraction form
    12,992.40/19,490.40 = 4,670.87/x
  3. Step 3: Cross multiply
    12,992.40x = 19,490.40 × 4,670.87
  4. Step 4: Simplify right side
    12,992.40x = 91,037,027.20
  5. Step 5: Solve for x
    x = 91,037,027.20/12,992.40
  6. Step 6: Final answer
    x = 7,006.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.