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Finding the Fourth Proportional to 65,640.51, 90,579.92 and 38,776.59

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Solution

The fourth proportional to 65,640.51, 90,579.92 and 38,776.59 is: 53,509.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,640.51 : 90,579.92 = 38,776.59 : x
  2. Step 2: Convert to fraction form
    65,640.51/90,579.92 = 38,776.59/x
  3. Step 3: Cross multiply
    65,640.51x = 90,579.92 × 38,776.59
  4. Step 4: Simplify right side
    65,640.51x = 3,512,380,226.19
  5. Step 5: Solve for x
    x = 3,512,380,226.19/65,640.51
  6. Step 6: Final answer
    x = 53,509.34

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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.