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Finding the Fourth Proportional to 70,631.40, 106,119.90 and 53,135.40

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Solution

The fourth proportional to 70,631.40, 106,119.90 and 53,135.40 is: 79,833.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,631.40 : 106,119.90 = 53,135.40 : x
  2. Step 2: Convert to fraction form
    70,631.40/106,119.90 = 53,135.40/x
  3. Step 3: Cross multiply
    70,631.40x = 106,119.90 × 53,135.40
  4. Step 4: Simplify right side
    70,631.40x = 5,638,723,334.46
  5. Step 5: Solve for x
    x = 5,638,723,334.46/70,631.40
  6. Step 6: Final answer
    x = 79,833.10

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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.