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Finding the Fourth Proportional to 155,051.70, 213,999.21 and 91,385.70

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Solution

The fourth proportional to 155,051.70, 213,999.21 and 91,385.70 is: 126,128.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,051.70 : 213,999.21 = 91,385.70 : x
  2. Step 2: Convert to fraction form
    155,051.70/213,999.21 = 91,385.70/x
  3. Step 3: Cross multiply
    155,051.70x = 213,999.21 × 91,385.70
  4. Step 4: Simplify right side
    155,051.70x = 19,556,467,605.30
  5. Step 5: Solve for x
    x = 19,556,467,605.30/155,051.70
  6. Step 6: Final answer
    x = 126,128.69

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1.5x scale

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.