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Finding the Fourth Proportional to 65,605.16, 90,558.52 and 38,747.80

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Solution

The fourth proportional to 65,605.16, 90,558.52 and 38,747.80 is: 53,485.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,605.16 : 90,558.52 = 38,747.80 : x
  2. Step 2: Convert to fraction form
    65,605.16/90,558.52 = 38,747.80/x
  3. Step 3: Cross multiply
    65,605.16x = 90,558.52 × 38,747.80
  4. Step 4: Simplify right side
    65,605.16x = 3,508,943,421.26
  5. Step 5: Solve for x
    x = 3,508,943,421.26/65,605.16
  6. Step 6: Final answer
    x = 53,485.78

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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.