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Finding the Fourth Proportional to 11,507.76, 15,881.19 and 6,472.20

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Solution

The fourth proportional to 11,507.76, 15,881.19 and 6,472.20 is: 8,931.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,507.76 : 15,881.19 = 6,472.20 : x
  2. Step 2: Convert to fraction form
    11,507.76/15,881.19 = 6,472.20/x
  3. Step 3: Cross multiply
    11,507.76x = 15,881.19 × 6,472.20
  4. Step 4: Simplify right side
    11,507.76x = 102,786,237.92
  5. Step 5: Solve for x
    x = 102,786,237.92/11,507.76
  6. Step 6: Final answer
    x = 8,931.91

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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.