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Finding the Fourth Proportional to 101,208.56, 139,675.80 and 58,780.40

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Solution

The fourth proportional to 101,208.56, 139,675.80 and 58,780.40 is: 81,121.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,208.56 : 139,675.80 = 58,780.40 : x
  2. Step 2: Convert to fraction form
    101,208.56/139,675.80 = 58,780.40/x
  3. Step 3: Cross multiply
    101,208.56x = 139,675.80 × 58,780.40
  4. Step 4: Simplify right side
    101,208.56x = 8,210,199,394.32
  5. Step 5: Solve for x
    x = 8,210,199,394.32/101,208.56
  6. Step 6: Final answer
    x = 81,121.59

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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.