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Finding the Fourth Proportional to 56,939.80, 85,409.70 and 54,347.80

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Solution

The fourth proportional to 56,939.80, 85,409.70 and 54,347.80 is: 81,521.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,939.80 : 85,409.70 = 54,347.80 : x
  2. Step 2: Convert to fraction form
    56,939.80/85,409.70 = 54,347.80/x
  3. Step 3: Cross multiply
    56,939.80x = 85,409.70 × 54,347.80
  4. Step 4: Simplify right side
    56,939.80x = 4,641,829,293.66
  5. Step 5: Solve for x
    x = 4,641,829,293.66/56,939.80
  6. Step 6: Final answer
    x = 81,521.70

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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.