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Finding the Fourth Proportional to 65,744.64, 90,744.48 and 40,579.68

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Solution

The fourth proportional to 65,744.64, 90,744.48 and 40,579.68 is: 56,010.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,744.64 : 90,744.48 = 40,579.68 : x
  2. Step 2: Convert to fraction form
    65,744.64/90,744.48 = 40,579.68/x
  3. Step 3: Cross multiply
    65,744.64x = 90,744.48 × 40,579.68
  4. Step 4: Simplify right side
    65,744.64x = 3,682,381,960.17
  5. Step 5: Solve for x
    x = 3,682,381,960.17/65,744.64
  6. Step 6: Final answer
    x = 56,010.38

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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.