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Finding the Fourth Proportional to 65,999.96, 91,071.78 and 42,140.60

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Solution

The fourth proportional to 65,999.96, 91,071.78 and 42,140.60 is: 58,148.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,999.96 : 91,071.78 = 42,140.60 : x
  2. Step 2: Convert to fraction form
    65,999.96/91,071.78 = 42,140.60/x
  3. Step 3: Cross multiply
    65,999.96x = 91,071.78 × 42,140.60
  4. Step 4: Simplify right side
    65,999.96x = 3,837,819,452.27
  5. Step 5: Solve for x
    x = 3,837,819,452.27/65,999.96
  6. Step 6: Final answer
    x = 58,148.81

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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.