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Finding the Fourth Proportional to 12,315.79, 16,997.87 and 7,009.88

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Solution

The fourth proportional to 12,315.79, 16,997.87 and 7,009.88 is: 9,674.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,315.79 : 16,997.87 = 7,009.88 : x
  2. Step 2: Convert to fraction form
    12,315.79/16,997.87 = 7,009.88/x
  3. Step 3: Cross multiply
    12,315.79x = 16,997.87 × 7,009.88
  4. Step 4: Simplify right side
    12,315.79x = 119,152,993.91
  5. Step 5: Solve for x
    x = 119,152,993.91/12,315.79
  6. Step 6: Final answer
    x = 9,674.82

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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.