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Finding the Fourth Proportional to 70,750.19, 106,125.29 and 20,830.30

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Solution

The fourth proportional to 70,750.19, 106,125.29 and 20,830.30 is: 31,245.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,750.19 : 106,125.29 = 20,830.30 : x
  2. Step 2: Convert to fraction form
    70,750.19/106,125.29 = 20,830.30/x
  3. Step 3: Cross multiply
    70,750.19x = 106,125.29 × 20,830.30
  4. Step 4: Simplify right side
    70,750.19x = 2,210,620,993.51
  5. Step 5: Solve for x
    x = 2,210,620,993.51/70,750.19
  6. Step 6: Final answer
    x = 31,245.44

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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.