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Finding the Fourth Proportional to 70,728.80, 106,090.72 and 18,138.72

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Solution

The fourth proportional to 70,728.80, 106,090.72 and 18,138.72 is: 27,207.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,728.80 : 106,090.72 = 18,138.72 : x
  2. Step 2: Convert to fraction form
    70,728.80/106,090.72 = 18,138.72/x
  3. Step 3: Cross multiply
    70,728.80x = 106,090.72 × 18,138.72
  4. Step 4: Simplify right side
    70,728.80x = 1,924,349,864.68
  5. Step 5: Solve for x
    x = 1,924,349,864.68/70,728.80
  6. Step 6: Final answer
    x = 27,207.44

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1.5x scale

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.