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Finding the Fourth Proportional to 101,018.72, 139,403.64 and 58,581.20

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Solution

The fourth proportional to 101,018.72, 139,403.64 and 58,581.20 is: 80,840.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,018.72 : 139,403.64 = 58,581.20 : x
  2. Step 2: Convert to fraction form
    101,018.72/139,403.64 = 58,581.20/x
  3. Step 3: Cross multiply
    101,018.72x = 139,403.64 × 58,581.20
  4. Step 4: Simplify right side
    101,018.72x = 8,166,432,515.57
  5. Step 5: Solve for x
    x = 8,166,432,515.57/101,018.72
  6. Step 6: Final answer
    x = 80,840.78

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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.