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Finding the Fourth Proportional to 85,799.98, 128,623.42 and 43,656.49

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Solution

The fourth proportional to 85,799.98, 128,623.42 and 43,656.49 is: 65,445.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,799.98 : 128,623.42 = 43,656.49 : x
  2. Step 2: Convert to fraction form
    85,799.98/128,623.42 = 43,656.49/x
  3. Step 3: Cross multiply
    85,799.98x = 128,623.42 × 43,656.49
  4. Step 4: Simplify right side
    85,799.98x = 5,615,246,618.30
  5. Step 5: Solve for x
    x = 5,615,246,618.30/85,799.98
  6. Step 6: Final answer
    x = 65,445.78

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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.