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Finding the Fourth Proportional to 12,879.95, 17,774.55 and 7,214.65

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Solution

The fourth proportional to 12,879.95, 17,774.55 and 7,214.65 is: 9,956.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.95 : 17,774.55 = 7,214.65 : x
  2. Step 2: Convert to fraction form
    12,879.95/17,774.55 = 7,214.65/x
  3. Step 3: Cross multiply
    12,879.95x = 17,774.55 × 7,214.65
  4. Step 4: Simplify right side
    12,879.95x = 128,237,139.78
  5. Step 5: Solve for x
    x = 128,237,139.78/12,879.95
  6. Step 6: Final answer
    x = 9,956.34

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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.