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Finding the Fourth Proportional to 90,999.70, 125,999.49 and 84,001.30

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Solution

The fourth proportional to 90,999.70, 125,999.49 and 84,001.30 is: 116,309.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,999.70 : 125,999.49 = 84,001.30 : x
  2. Step 2: Convert to fraction form
    90,999.70/125,999.49 = 84,001.30/x
  3. Step 3: Cross multiply
    90,999.70x = 125,999.49 × 84,001.30
  4. Step 4: Simplify right side
    90,999.70x = 10,584,120,959.34
  5. Step 5: Solve for x
    x = 10,584,120,959.34/90,999.70
  6. Step 6: Final answer
    x = 116,309.40

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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.