Home / 138,679.76-191,378.08-78,263.20

Finding the Fourth Proportional to 138,679.76, 191,378.08 and 78,263.20

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Solution

The fourth proportional to 138,679.76, 191,378.08 and 78,263.20 is: 108,003.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,679.76 : 191,378.08 = 78,263.20 : x
  2. Step 2: Convert to fraction form
    138,679.76/191,378.08 = 78,263.20/x
  3. Step 3: Cross multiply
    138,679.76x = 191,378.08 × 78,263.20
  4. Step 4: Simplify right side
    138,679.76x = 14,977,860,950.66
  5. Step 5: Solve for x
    x = 14,977,860,950.66/138,679.76
  6. Step 6: Final answer
    x = 108,003.22

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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.