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Finding the Fourth Proportional to 100,845.72, 139,165.74 and 56,133.72

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Solution

The fourth proportional to 100,845.72, 139,165.74 and 56,133.72 is: 77,463.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,845.72 : 139,165.74 = 56,133.72 : x
  2. Step 2: Convert to fraction form
    100,845.72/139,165.74 = 56,133.72/x
  3. Step 3: Cross multiply
    100,845.72x = 139,165.74 × 56,133.72
  4. Step 4: Simplify right side
    100,845.72x = 7,811,890,682.75
  5. Step 5: Solve for x
    x = 7,811,890,682.75/100,845.72
  6. Step 6: Final answer
    x = 77,463.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.