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Finding the Fourth Proportional to 8,393.64, 11,581.56 and 7,139.76

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Solution

The fourth proportional to 8,393.64, 11,581.56 and 7,139.76 is: 9,851.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,393.64 : 11,581.56 = 7,139.76 : x
  2. Step 2: Convert to fraction form
    8,393.64/11,581.56 = 7,139.76/x
  3. Step 3: Cross multiply
    8,393.64x = 11,581.56 × 7,139.76
  4. Step 4: Simplify right side
    8,393.64x = 82,689,558.83
  5. Step 5: Solve for x
    x = 82,689,558.83/8,393.64
  6. Step 6: Final answer
    x = 9,851.45

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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.