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Finding the Fourth Proportional to 65,428.75, 90,291.68 and 35,620.75

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Solution

The fourth proportional to 65,428.75, 90,291.68 and 35,620.75 is: 49,156.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,428.75 : 90,291.68 = 35,620.75 : x
  2. Step 2: Convert to fraction form
    65,428.75/90,291.68 = 35,620.75/x
  3. Step 3: Cross multiply
    65,428.75x = 90,291.68 × 35,620.75
  4. Step 4: Simplify right side
    65,428.75x = 3,216,257,360.36
  5. Step 5: Solve for x
    x = 3,216,257,360.36/65,428.75
  6. Step 6: Final answer
    x = 49,156.64

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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.