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Finding the Fourth Proportional to 85,619.76, 128,407.56 and 25,636.40

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Solution

The fourth proportional to 85,619.76, 128,407.56 and 25,636.40 is: 38,447.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,619.76 : 128,407.56 = 25,636.40 : x
  2. Step 2: Convert to fraction form
    85,619.76/128,407.56 = 25,636.40/x
  3. Step 3: Cross multiply
    85,619.76x = 128,407.56 × 25,636.40
  4. Step 4: Simplify right side
    85,619.76x = 3,291,907,571.18
  5. Step 5: Solve for x
    x = 3,291,907,571.18/85,619.76
  6. Step 6: Final answer
    x = 38,447.99

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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.