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Finding the Fourth Proportional to 65,661.60, 90,590.22 and 39,828.40

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Solution

The fourth proportional to 65,661.60, 90,590.22 and 39,828.40 is: 54,949.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,661.60 : 90,590.22 = 39,828.40 : x
  2. Step 2: Convert to fraction form
    65,661.60/90,590.22 = 39,828.40/x
  3. Step 3: Cross multiply
    65,661.60x = 90,590.22 × 39,828.40
  4. Step 4: Simplify right side
    65,661.60x = 3,608,063,518.25
  5. Step 5: Solve for x
    x = 3,608,063,518.25/65,661.60
  6. Step 6: Final answer
    x = 54,949.37

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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.