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Finding the Fourth Proportional to 52,606.20, 78,870.90 and 21,425.40

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Solution

The fourth proportional to 52,606.20, 78,870.90 and 21,425.40 is: 32,122.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,606.20 : 78,870.90 = 21,425.40 : x
  2. Step 2: Convert to fraction form
    52,606.20/78,870.90 = 21,425.40/x
  3. Step 3: Cross multiply
    52,606.20x = 78,870.90 × 21,425.40
  4. Step 4: Simplify right side
    52,606.20x = 1,689,840,580.86
  5. Step 5: Solve for x
    x = 1,689,840,580.86/52,606.20
  6. Step 6: Final answer
    x = 32,122.46

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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.