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Finding the Fourth Proportional to 70,055.05, 105,071.30 and 20,123.79

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Solution

The fourth proportional to 70,055.05, 105,071.30 and 20,123.79 is: 30,182.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,055.05 : 105,071.30 = 20,123.79 : x
  2. Step 2: Convert to fraction form
    70,055.05/105,071.30 = 20,123.79/x
  3. Step 3: Cross multiply
    70,055.05x = 105,071.30 × 20,123.79
  4. Step 4: Simplify right side
    70,055.05x = 2,114,432,776.23
  5. Step 5: Solve for x
    x = 2,114,432,776.23/70,055.05
  6. Step 6: Final answer
    x = 30,182.45

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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.