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Finding the Fourth Proportional to 101,430.45, 139,982.76 and 58,986

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Solution

The fourth proportional to 101,430.45, 139,982.76 and 58,986 is: 81,405.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,430.45 : 139,982.76 = 58,986 : x
  2. Step 2: Convert to fraction form
    101,430.45/139,982.76 = 58,986/x
  3. Step 3: Cross multiply
    101,430.45x = 139,982.76 × 58,986
  4. Step 4: Simplify right side
    101,430.45x = 8,257,023,081.36
  5. Step 5: Solve for x
    x = 8,257,023,081.36/101,430.45
  6. Step 6: Final answer
    x = 81,405.76

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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.