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Finding the Fourth Proportional to 42,485.80, 63,746.10 and 18,780.80

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Solution

The fourth proportional to 42,485.80, 63,746.10 and 18,780.80 is: 28,178.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,485.80 : 63,746.10 = 18,780.80 : x
  2. Step 2: Convert to fraction form
    42,485.80/63,746.10 = 18,780.80/x
  3. Step 3: Cross multiply
    42,485.80x = 63,746.10 × 18,780.80
  4. Step 4: Simplify right side
    42,485.80x = 1,197,202,754.88
  5. Step 5: Solve for x
    x = 1,197,202,754.88/42,485.80
  6. Step 6: Final answer
    x = 28,178.89

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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.