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Finding the Fourth Proportional to 65,228.48, 90,015.36 and 35,420.48

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Solution

The fourth proportional to 65,228.48, 90,015.36 and 35,420.48 is: 48,880.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,228.48 : 90,015.36 = 35,420.48 : x
  2. Step 2: Convert to fraction form
    65,228.48/90,015.36 = 35,420.48/x
  3. Step 3: Cross multiply
    65,228.48x = 90,015.36 × 35,420.48
  4. Step 4: Simplify right side
    65,228.48x = 3,188,387,258.57
  5. Step 5: Solve for x
    x = 3,188,387,258.57/65,228.48
  6. Step 6: Final answer
    x = 48,880.29

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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.