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Finding the Fourth Proportional to 265,694.51, 398,619.41 and 85,775.72

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Solution

The fourth proportional to 265,694.51, 398,619.41 and 85,775.72 is: 128,688.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,694.51 : 398,619.41 = 85,775.72 : x
  2. Step 2: Convert to fraction form
    265,694.51/398,619.41 = 85,775.72/x
  3. Step 3: Cross multiply
    265,694.51x = 398,619.41 × 85,775.72
  4. Step 4: Simplify right side
    265,694.51x = 34,191,864,905.63
  5. Step 5: Solve for x
    x = 34,191,864,905.63/265,694.51
  6. Step 6: Final answer
    x = 128,688.64

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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.