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Finding the Fourth Proportional to 31,821.70, 47,720.40 and 9,627.70

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Solution

The fourth proportional to 31,821.70, 47,720.40 and 9,627.70 is: 14,437.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,821.70 : 47,720.40 = 9,627.70 : x
  2. Step 2: Convert to fraction form
    31,821.70/47,720.40 = 9,627.70/x
  3. Step 3: Cross multiply
    31,821.70x = 47,720.40 × 9,627.70
  4. Step 4: Simplify right side
    31,821.70x = 459,437,695.08
  5. Step 5: Solve for x
    x = 459,437,695.08/31,821.70
  6. Step 6: Final answer
    x = 14,437.87

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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.