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Finding the Fourth Proportional to 265,385.80, 398,078.70 and 253,138.60

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Solution

The fourth proportional to 265,385.80, 398,078.70 and 253,138.60 is: 379,707.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,385.80 : 398,078.70 = 253,138.60 : x
  2. Step 2: Convert to fraction form
    265,385.80/398,078.70 = 253,138.60/x
  3. Step 3: Cross multiply
    265,385.80x = 398,078.70 × 253,138.60
  4. Step 4: Simplify right side
    265,385.80x = 100,769,084,807.82
  5. Step 5: Solve for x
    x = 100,769,084,807.82/265,385.80
  6. Step 6: Final answer
    x = 379,707.90

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1.5x scale

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.