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Finding the Fourth Proportional to 47,286.40, 70,929.60 and 20,963.20

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Solution

The fourth proportional to 47,286.40, 70,929.60 and 20,963.20 is: 31,444.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,286.40 : 70,929.60 = 20,963.20 : x
  2. Step 2: Convert to fraction form
    47,286.40/70,929.60 = 20,963.20/x
  3. Step 3: Cross multiply
    47,286.40x = 70,929.60 × 20,963.20
  4. Step 4: Simplify right side
    47,286.40x = 1,486,911,390.72
  5. Step 5: Solve for x
    x = 1,486,911,390.72/47,286.40
  6. Step 6: Final answer
    x = 31,444.80

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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.