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Finding the Fourth Proportional to 12,958.87, 17,888.76 and 8,712.40

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Solution

The fourth proportional to 12,958.87, 17,888.76 and 8,712.40 is: 12,026.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,958.87 : 17,888.76 = 8,712.40 : x
  2. Step 2: Convert to fraction form
    12,958.87/17,888.76 = 8,712.40/x
  3. Step 3: Cross multiply
    12,958.87x = 17,888.76 × 8,712.40
  4. Step 4: Simplify right side
    12,958.87x = 155,854,032.62
  5. Step 5: Solve for x
    x = 155,854,032.62/12,958.87
  6. Step 6: Final answer
    x = 12,026.82

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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.