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Finding the Fourth Proportional to 47,145.60, 70,660.80 and 20,822.40

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Solution

The fourth proportional to 47,145.60, 70,660.80 and 20,822.40 is: 31,208.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,145.60 : 70,660.80 = 20,822.40 : x
  2. Step 2: Convert to fraction form
    47,145.60/70,660.80 = 20,822.40/x
  3. Step 3: Cross multiply
    47,145.60x = 70,660.80 × 20,822.40
  4. Step 4: Simplify right side
    47,145.60x = 1,471,327,441.92
  5. Step 5: Solve for x
    x = 1,471,327,441.92/47,145.60
  6. Step 6: Final answer
    x = 31,208.16

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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.