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Finding the Fourth Proportional to 145,715.40, 218,529.90 and 56,917.80

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Solution

The fourth proportional to 145,715.40, 218,529.90 and 56,917.80 is: 85,359.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,715.40 : 218,529.90 = 56,917.80 : x
  2. Step 2: Convert to fraction form
    145,715.40/218,529.90 = 56,917.80/x
  3. Step 3: Cross multiply
    145,715.40x = 218,529.90 × 56,917.80
  4. Step 4: Simplify right side
    145,715.40x = 12,438,241,142.22
  5. Step 5: Solve for x
    x = 12,438,241,142.22/145,715.40
  6. Step 6: Final answer
    x = 85,359.83

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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.