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Finding the Fourth Proportional to 103,749.70, 155,697.45 and 66,400.60

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Solution

The fourth proportional to 103,749.70, 155,697.45 and 66,400.60 is: 99,647.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,749.70 : 155,697.45 = 66,400.60 : x
  2. Step 2: Convert to fraction form
    103,749.70/155,697.45 = 66,400.60/x
  3. Step 3: Cross multiply
    103,749.70x = 155,697.45 × 66,400.60
  4. Step 4: Simplify right side
    103,749.70x = 10,338,404,098.47
  5. Step 5: Solve for x
    x = 10,338,404,098.47/103,749.70
  6. Step 6: Final answer
    x = 99,647.56

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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.