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Finding the Fourth Proportional to 90,699.63, 125,179.28 and 65,290.14

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Solution

The fourth proportional to 90,699.63, 125,179.28 and 65,290.14 is: 90,110.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,699.63 : 125,179.28 = 65,290.14 : x
  2. Step 2: Convert to fraction form
    90,699.63/125,179.28 = 65,290.14/x
  3. Step 3: Cross multiply
    90,699.63x = 125,179.28 × 65,290.14
  4. Step 4: Simplify right side
    90,699.63x = 8,172,972,389.85
  5. Step 5: Solve for x
    x = 8,172,972,389.85/90,699.63
  6. Step 6: Final answer
    x = 90,110.32

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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.