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Finding the Fourth Proportional to 70,937.64, 106,422.12 and 21,021.72

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Solution

The fourth proportional to 70,937.64, 106,422.12 and 21,021.72 is: 31,537.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,937.64 : 106,422.12 = 21,021.72 : x
  2. Step 2: Convert to fraction form
    70,937.64/106,422.12 = 21,021.72/x
  3. Step 3: Cross multiply
    70,937.64x = 106,422.12 × 21,021.72
  4. Step 4: Simplify right side
    70,937.64x = 2,237,176,008.45
  5. Step 5: Solve for x
    x = 2,237,176,008.45/70,937.64
  6. Step 6: Final answer
    x = 31,537.22

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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.