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Finding the Fourth Proportional to 12,475.15, 18,707.21 and 4,678.49

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Solution

The fourth proportional to 12,475.15, 18,707.21 and 4,678.49 is: 7,015.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,475.15 : 18,707.21 = 4,678.49 : x
  2. Step 2: Convert to fraction form
    12,475.15/18,707.21 = 4,678.49/x
  3. Step 3: Cross multiply
    12,475.15x = 18,707.21 × 4,678.49
  4. Step 4: Simplify right side
    12,475.15x = 87,521,494.91
  5. Step 5: Solve for x
    x = 87,521,494.91/12,475.15
  6. Step 6: Final answer
    x = 7,015.67

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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.