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Finding the Fourth Proportional to 85,636.53, 128,267.55 and 43,443.90

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Solution

The fourth proportional to 85,636.53, 128,267.55 and 43,443.90 is: 65,070.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,636.53 : 128,267.55 = 43,443.90 : x
  2. Step 2: Convert to fraction form
    85,636.53/128,267.55 = 43,443.90/x
  3. Step 3: Cross multiply
    85,636.53x = 128,267.55 × 43,443.90
  4. Step 4: Simplify right side
    85,636.53x = 5,572,442,615.45
  5. Step 5: Solve for x
    x = 5,572,442,615.45/85,636.53
  6. Step 6: Final answer
    x = 65,070.86

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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.