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Finding the Fourth Proportional to 12,690.90, 17,513.79 and 7,101.90

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Solution

The fourth proportional to 12,690.90, 17,513.79 and 7,101.90 is: 9,800.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.90 : 17,513.79 = 7,101.90 : x
  2. Step 2: Convert to fraction form
    12,690.90/17,513.79 = 7,101.90/x
  3. Step 3: Cross multiply
    12,690.90x = 17,513.79 × 7,101.90
  4. Step 4: Simplify right side
    12,690.90x = 124,381,185.20
  5. Step 5: Solve for x
    x = 124,381,185.20/12,690.90
  6. Step 6: Final answer
    x = 9,800.82

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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.