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Finding the Fourth Proportional to 56,420.80, 84,635.46 and 18,980.98

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Solution

The fourth proportional to 56,420.80, 84,635.46 and 18,980.98 is: 28,472.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,420.80 : 84,635.46 = 18,980.98 : x
  2. Step 2: Convert to fraction form
    56,420.80/84,635.46 = 18,980.98/x
  3. Step 3: Cross multiply
    56,420.80x = 84,635.46 × 18,980.98
  4. Step 4: Simplify right side
    56,420.80x = 1,606,463,973.55
  5. Step 5: Solve for x
    x = 1,606,463,973.55/56,420.80
  6. Step 6: Final answer
    x = 28,472.90

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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.