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Finding the Fourth Proportional to 85,820.70, 128,740.65 and 26,655.90

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Solution

The fourth proportional to 85,820.70, 128,740.65 and 26,655.90 is: 39,986.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,820.70 : 128,740.65 = 26,655.90 : x
  2. Step 2: Convert to fraction form
    85,820.70/128,740.65 = 26,655.90/x
  3. Step 3: Cross multiply
    85,820.70x = 128,740.65 × 26,655.90
  4. Step 4: Simplify right side
    85,820.70x = 3,431,697,892.34
  5. Step 5: Solve for x
    x = 3,431,697,892.34/85,820.70
  6. Step 6: Final answer
    x = 39,986.83

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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.