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Finding the Fourth Proportional to 85,848.80, 128,773.20 and 81,037.40

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Solution

The fourth proportional to 85,848.80, 128,773.20 and 81,037.40 is: 121,556.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,848.80 : 128,773.20 = 81,037.40 : x
  2. Step 2: Convert to fraction form
    85,848.80/128,773.20 = 81,037.40/x
  3. Step 3: Cross multiply
    85,848.80x = 128,773.20 × 81,037.40
  4. Step 4: Simplify right side
    85,848.80x = 10,435,445,317.68
  5. Step 5: Solve for x
    x = 10,435,445,317.68/85,848.80
  6. Step 6: Final answer
    x = 121,556.10

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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.