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Finding the Fourth Proportional to 70,139.50, 96,779.66 and 39,923.06

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Solution

The fourth proportional to 70,139.50, 96,779.66 and 39,923.06 is: 55,086.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,139.50 : 96,779.66 = 39,923.06 : x
  2. Step 2: Convert to fraction form
    70,139.50/96,779.66 = 39,923.06/x
  3. Step 3: Cross multiply
    70,139.50x = 96,779.66 × 39,923.06
  4. Step 4: Simplify right side
    70,139.50x = 3,863,740,172.96
  5. Step 5: Solve for x
    x = 3,863,740,172.96/70,139.50
  6. Step 6: Final answer
    x = 55,086.51

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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.