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Finding the Fourth Proportional to 70,020.81, 105,036.48 and 20,100.51

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Solution

The fourth proportional to 70,020.81, 105,036.48 and 20,100.51 is: 30,152.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,020.81 : 105,036.48 = 20,100.51 : x
  2. Step 2: Convert to fraction form
    70,020.81/105,036.48 = 20,100.51/x
  3. Step 3: Cross multiply
    70,020.81x = 105,036.48 × 20,100.51
  4. Step 4: Simplify right side
    70,020.81x = 2,111,286,816.60
  5. Step 5: Solve for x
    x = 2,111,286,816.60/70,020.81
  6. Step 6: Final answer
    x = 30,152.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.