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Finding the Fourth Proportional to 65,403.72, 90,274.50 and 40,274.28

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Solution

The fourth proportional to 65,403.72, 90,274.50 and 40,274.28 is: 55,589.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,403.72 : 90,274.50 = 40,274.28 : x
  2. Step 2: Convert to fraction form
    65,403.72/90,274.50 = 40,274.28/x
  3. Step 3: Cross multiply
    65,403.72x = 90,274.50 × 40,274.28
  4. Step 4: Simplify right side
    65,403.72x = 3,635,740,489.86
  5. Step 5: Solve for x
    x = 3,635,740,489.86/65,403.72
  6. Step 6: Final answer
    x = 55,589.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.