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Finding the Fourth Proportional to 12,908.87, 17,813.15 and 7,242.85

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Solution

The fourth proportional to 12,908.87, 17,813.15 and 7,242.85 is: 9,994.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,908.87 : 17,813.15 = 7,242.85 : x
  2. Step 2: Convert to fraction form
    12,908.87/17,813.15 = 7,242.85/x
  3. Step 3: Cross multiply
    12,908.87x = 17,813.15 × 7,242.85
  4. Step 4: Simplify right side
    12,908.87x = 129,017,937.26
  5. Step 5: Solve for x
    x = 129,017,937.26/12,908.87
  6. Step 6: Final answer
    x = 9,994.52

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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.