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Finding the Fourth Proportional to 265,306.86, 397,986.48 and 85,412.88

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Solution

The fourth proportional to 265,306.86, 397,986.48 and 85,412.88 is: 128,127.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,306.86 : 397,986.48 = 85,412.88 : x
  2. Step 2: Convert to fraction form
    265,306.86/397,986.48 = 85,412.88/x
  3. Step 3: Cross multiply
    265,306.86x = 397,986.48 × 85,412.88
  4. Step 4: Simplify right side
    265,306.86x = 33,993,171,457.86
  5. Step 5: Solve for x
    x = 33,993,171,457.86/265,306.86
  6. Step 6: Final answer
    x = 128,127.75

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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.