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Finding the Fourth Proportional to 65,642.76, 90,396.38 and 57,025.00

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Solution

The fourth proportional to 65,642.76, 90,396.38 and 57,025.00 is: 78,528.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,642.76 : 90,396.38 = 57,025.00 : x
  2. Step 2: Convert to fraction form
    65,642.76/90,396.38 = 57,025.00/x
  3. Step 3: Cross multiply
    65,642.76x = 90,396.38 × 57,025.00
  4. Step 4: Simplify right side
    65,642.76x = 5,154,853,825.06
  5. Step 5: Solve for x
    x = 5,154,853,825.06/65,642.76
  6. Step 6: Final answer
    x = 78,528.90

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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.