Home / 138,679.16-191,366.35-78,264.50

Finding the Fourth Proportional to 138,679.16, 191,366.35 and 78,264.50

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Solution

The fourth proportional to 138,679.16, 191,366.35 and 78,264.50 is: 107,998.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,679.16 : 191,366.35 = 78,264.50 : x
  2. Step 2: Convert to fraction form
    138,679.16/191,366.35 = 78,264.50/x
  3. Step 3: Cross multiply
    138,679.16x = 191,366.35 × 78,264.50
  4. Step 4: Simplify right side
    138,679.16x = 14,977,190,547.08
  5. Step 5: Solve for x
    x = 14,977,190,547.08/138,679.16
  6. Step 6: Final answer
    x = 107,998.86

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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.