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Finding the Fourth Proportional to 90,999.70, 136,499.55 and 71,972.80

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Solution

The fourth proportional to 90,999.70, 136,499.55 and 71,972.80 is: 107,959.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,999.70 : 136,499.55 = 71,972.80 : x
  2. Step 2: Convert to fraction form
    90,999.70/136,499.55 = 71,972.80/x
  3. Step 3: Cross multiply
    90,999.70x = 136,499.55 × 71,972.80
  4. Step 4: Simplify right side
    90,999.70x = 9,824,254,812.24
  5. Step 5: Solve for x
    x = 9,824,254,812.24/90,999.70
  6. Step 6: Final answer
    x = 107,959.20

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1.5x scale

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.