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Finding the Fourth Proportional to 12,904.45, 17,807.85 and 7,239.11

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Solution

The fourth proportional to 12,904.45, 17,807.85 and 7,239.11 is: 9,989.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,904.45 : 17,807.85 = 7,239.11 : x
  2. Step 2: Convert to fraction form
    12,904.45/17,807.85 = 7,239.11/x
  3. Step 3: Cross multiply
    12,904.45x = 17,807.85 × 7,239.11
  4. Step 4: Simplify right side
    12,904.45x = 128,912,895.97
  5. Step 5: Solve for x
    x = 128,912,895.97/12,904.45
  6. Step 6: Final answer
    x = 9,989.80

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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.