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Finding the Fourth Proportional to 265,979.52, 399,034.44 and 78,991.20

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Solution

The fourth proportional to 265,979.52, 399,034.44 and 78,991.20 is: 118,506.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,979.52 : 399,034.44 = 78,991.20 : x
  2. Step 2: Convert to fraction form
    265,979.52/399,034.44 = 78,991.20/x
  3. Step 3: Cross multiply
    265,979.52x = 399,034.44 × 78,991.20
  4. Step 4: Simplify right side
    265,979.52x = 31,520,209,256.93
  5. Step 5: Solve for x
    x = 31,520,209,256.93/265,979.52
  6. Step 6: Final answer
    x = 118,506.15

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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.