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Finding the Fourth Proportional to 265,887.54, 398,909.07 and 78,903.90

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Solution

The fourth proportional to 265,887.54, 398,909.07 and 78,903.90 is: 118,378.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,887.54 : 398,909.07 = 78,903.90 : x
  2. Step 2: Convert to fraction form
    265,887.54/398,909.07 = 78,903.90/x
  3. Step 3: Cross multiply
    265,887.54x = 398,909.07 × 78,903.90
  4. Step 4: Simplify right side
    265,887.54x = 31,475,481,368.37
  5. Step 5: Solve for x
    x = 31,475,481,368.37/265,887.54
  6. Step 6: Final answer
    x = 118,378.93

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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.