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Finding the Fourth Proportional to 70,139.64, 96,779.56 and 39,923.16

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Solution

The fourth proportional to 70,139.64, 96,779.56 and 39,923.16 is: 55,086.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,139.64 : 96,779.56 = 39,923.16 : x
  2. Step 2: Convert to fraction form
    70,139.64/96,779.56 = 39,923.16/x
  3. Step 3: Cross multiply
    70,139.64x = 96,779.56 × 39,923.16
  4. Step 4: Simplify right side
    70,139.64x = 3,863,745,858.61
  5. Step 5: Solve for x
    x = 3,863,745,858.61/70,139.64
  6. Step 6: Final answer
    x = 55,086.48

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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.