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Finding the Fourth Proportional to 70,913.02, 106,369.20 and 20,993.40

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Solution

The fourth proportional to 70,913.02, 106,369.20 and 20,993.40 is: 31,490.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,913.02 : 106,369.20 = 20,993.40 : x
  2. Step 2: Convert to fraction form
    70,913.02/106,369.20 = 20,993.40/x
  3. Step 3: Cross multiply
    70,913.02x = 106,369.20 × 20,993.40
  4. Step 4: Simplify right side
    70,913.02x = 2,233,051,163.28
  5. Step 5: Solve for x
    x = 2,233,051,163.28/70,913.02
  6. Step 6: Final answer
    x = 31,490.00

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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.