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Finding the Fourth Proportional to 59,871.20, 89,806.80 and 20,415.20

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Solution

The fourth proportional to 59,871.20, 89,806.80 and 20,415.20 is: 30,622.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    59,871.20 : 89,806.80 = 20,415.20 : x
  2. Step 2: Convert to fraction form
    59,871.20/89,806.80 = 20,415.20/x
  3. Step 3: Cross multiply
    59,871.20x = 89,806.80 × 20,415.20
  4. Step 4: Simplify right side
    59,871.20x = 1,833,423,783.36
  5. Step 5: Solve for x
    x = 1,833,423,783.36/59,871.20
  6. Step 6: Final answer
    x = 30,622.80

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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.