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Finding the Fourth Proportional to 265,720.28, 398,581.86 and 78,733.40

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Solution

The fourth proportional to 265,720.28, 398,581.86 and 78,733.40 is: 118,100.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,720.28 : 398,581.86 = 78,733.40 : x
  2. Step 2: Convert to fraction form
    265,720.28/398,581.86 = 78,733.40/x
  3. Step 3: Cross multiply
    265,720.28x = 398,581.86 × 78,733.40
  4. Step 4: Simplify right side
    265,720.28x = 31,381,705,016.12
  5. Step 5: Solve for x
    x = 31,381,705,016.12/265,720.28
  6. Step 6: Final answer
    x = 118,100.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.