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Finding the Fourth Proportional to 85,453.20, 128,128.60 and 43,981.20

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Solution

The fourth proportional to 85,453.20, 128,128.60 and 43,981.20 is: 65,945.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,453.20 : 128,128.60 = 43,981.20 : x
  2. Step 2: Convert to fraction form
    85,453.20/128,128.60 = 43,981.20/x
  3. Step 3: Cross multiply
    85,453.20x = 128,128.60 × 43,981.20
  4. Step 4: Simplify right side
    85,453.20x = 5,635,249,582.32
  5. Step 5: Solve for x
    x = 5,635,249,582.32/85,453.20
  6. Step 6: Final answer
    x = 65,945.45

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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.