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Finding the Fourth Proportional to 265,756.28, 398,674.58 and 85,781.57

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Solution

The fourth proportional to 265,756.28, 398,674.58 and 85,781.57 is: 128,685.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,756.28 : 398,674.58 = 85,781.57 : x
  2. Step 2: Convert to fraction form
    265,756.28/398,674.58 = 85,781.57/x
  3. Step 3: Cross multiply
    265,756.28x = 398,674.58 × 85,781.57
  4. Step 4: Simplify right side
    265,756.28x = 34,198,928,969.21
  5. Step 5: Solve for x
    x = 34,198,928,969.21/265,756.28
  6. Step 6: Final answer
    x = 128,685.31

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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.