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Finding the Fourth Proportional to 7,903.64, 11,859.60 and 5,129.66

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Solution

The fourth proportional to 7,903.64, 11,859.60 and 5,129.66 is: 7,697.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,903.64 : 11,859.60 = 5,129.66 : x
  2. Step 2: Convert to fraction form
    7,903.64/11,859.60 = 5,129.66/x
  3. Step 3: Cross multiply
    7,903.64x = 11,859.60 × 5,129.66
  4. Step 4: Simplify right side
    7,903.64x = 60,835,715.74
  5. Step 5: Solve for x
    x = 60,835,715.74/7,903.64
  6. Step 6: Final answer
    x = 7,697.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.