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Finding the Fourth Proportional to 8,721.70, 12,035.70 and 4,742.68

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Solution

The fourth proportional to 8,721.70, 12,035.70 and 4,742.68 is: 6,544.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.70 : 12,035.70 = 4,742.68 : x
  2. Step 2: Convert to fraction form
    8,721.70/12,035.70 = 4,742.68/x
  3. Step 3: Cross multiply
    8,721.70x = 12,035.70 × 4,742.68
  4. Step 4: Simplify right side
    8,721.70x = 57,081,473.68
  5. Step 5: Solve for x
    x = 57,081,473.68/8,721.70
  6. Step 6: Final answer
    x = 6,544.76

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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.