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Finding the Fourth Proportional to 114,890.40, 171,995.40 and 85,438.80

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Solution

The fourth proportional to 114,890.40, 171,995.40 and 85,438.80 is: 127,905.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    114,890.40 : 171,995.40 = 85,438.80 : x
  2. Step 2: Convert to fraction form
    114,890.40/171,995.40 = 85,438.80/x
  3. Step 3: Cross multiply
    114,890.40x = 171,995.40 × 85,438.80
  4. Step 4: Simplify right side
    114,890.40x = 14,695,080,581.52
  5. Step 5: Solve for x
    x = 14,695,080,581.52/114,890.40
  6. Step 6: Final answer
    x = 127,905.21

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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.