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Finding the Fourth Proportional to 265,505.28, 398,259.36 and 78,518.40

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Solution

The fourth proportional to 265,505.28, 398,259.36 and 78,518.40 is: 117,778.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,505.28 : 398,259.36 = 78,518.40 : x
  2. Step 2: Convert to fraction form
    265,505.28/398,259.36 = 78,518.40/x
  3. Step 3: Cross multiply
    265,505.28x = 398,259.36 × 78,518.40
  4. Step 4: Simplify right side
    265,505.28x = 31,270,687,732.22
  5. Step 5: Solve for x
    x = 31,270,687,732.22/265,505.28
  6. Step 6: Final answer
    x = 117,778.03

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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.