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Finding the Fourth Proportional to 70,937.30, 106,421.52 and 21,021.31

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Solution

The fourth proportional to 70,937.30, 106,421.52 and 21,021.31 is: 31,536.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,937.30 : 106,421.52 = 21,021.31 : x
  2. Step 2: Convert to fraction form
    70,937.30/106,421.52 = 21,021.31/x
  3. Step 3: Cross multiply
    70,937.30x = 106,421.52 × 21,021.31
  4. Step 4: Simplify right side
    70,937.30x = 2,237,119,316.70
  5. Step 5: Solve for x
    x = 2,237,119,316.70/70,937.30
  6. Step 6: Final answer
    x = 31,536.57

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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.