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Finding the Fourth Proportional to 127,051.80, 175,328.87 and 78,640.89

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Solution

The fourth proportional to 127,051.80, 175,328.87 and 78,640.89 is: 108,522.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,051.80 : 175,328.87 = 78,640.89 : x
  2. Step 2: Convert to fraction form
    127,051.80/175,328.87 = 78,640.89/x
  3. Step 3: Cross multiply
    127,051.80x = 175,328.87 × 78,640.89
  4. Step 4: Simplify right side
    127,051.80x = 13,788,018,379.49
  5. Step 5: Solve for x
    x = 13,788,018,379.49/127,051.80
  6. Step 6: Final answer
    x = 108,522.81

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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.