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Finding the Fourth Proportional to 143,247.21, 197,686.65 and 78,719.16

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Solution

The fourth proportional to 143,247.21, 197,686.65 and 78,719.16 is: 108,635.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,247.21 : 197,686.65 = 78,719.16 : x
  2. Step 2: Convert to fraction form
    143,247.21/197,686.65 = 78,719.16/x
  3. Step 3: Cross multiply
    143,247.21x = 197,686.65 × 78,719.16
  4. Step 4: Simplify right side
    143,247.21x = 15,561,727,031.21
  5. Step 5: Solve for x
    x = 15,561,727,031.21/143,247.21
  6. Step 6: Final answer
    x = 108,635.46

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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.