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Finding the Fourth Proportional to 70,349.70, 105,530.02 and 20,430.62

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Solution

The fourth proportional to 70,349.70, 105,530.02 and 20,430.62 is: 30,647.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,349.70 : 105,530.02 = 20,430.62 : x
  2. Step 2: Convert to fraction form
    70,349.70/105,530.02 = 20,430.62/x
  3. Step 3: Cross multiply
    70,349.70x = 105,530.02 × 20,430.62
  4. Step 4: Simplify right side
    70,349.70x = 2,156,043,737.21
  5. Step 5: Solve for x
    x = 2,156,043,737.21/70,349.70
  6. Step 6: Final answer
    x = 30,647.52

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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.